Repairing and anti-fouling the hull 

Nice 1 again. Love Marvin Martian! Keep up the good work, you and your m8s, thanks. I can't believe it at 65, I'm learnin stuff!

Brilliant painting job. That would have taken me hours! You did it in minutes, well done.

Im a dummy.. i cant tell you how gratefull i am to have this knowledge passed down. you are one of a kind . thank you from all of us. you and your mates are actually funny at times. cheers!

Man Stu thats some real perseverance, 6 minutes in is usually when I start to think about selling things.

Awesome video At last a true view of aluminum welding, everything you see on here shows a perfect stack of dimes as a result. I am teaching myself to tig aluminum on an old John boat and have been coming up with the same result that you have, at least now I know I'm headed in the right direction

i've watched about 7 of your videos in the past day and really appreciate your approach to videography. Far too many how-to videos out there lack a real conversation in how to approach a process, both figuratively and literally. I enjoyed the bit of you and the other fella sitting in your office talking about antifouling.

Hey bud pro tip, when welding up cracks its best to drill the tip of the crack with a pin hole to stop the crack from returning, and to remember that aluminum welds differently at different metal temps, ie as the base metal temp raises it takes more pedal to weld, I like to give cooldown times to my weld times when working aluminum

Here is a cool hint to coating boat bottoms. Mix up a couple packages or bottles of cyan pepper in your bottom paint. Why you ask me? Barnacles are small animals that don't like hot things so they won't attach to the painted bottom.with the pepper in the paint it will last a long time. I saw this in an article in a magazine 40 years ago. It works try it next time.

I greatly appreciate your help and expertise

It started out looking like a Laural & Hardy 😂 Very good guys

man I love watching your videos every one of them are the best on youtube

I purchased a '60's Gregor 12' welded aluminum boat from a government site. It was used in fresh water all it's life. I'm using it as a tender in the SF bay area (salt water). After fairly extensive research I will use the Interlux 2 part 2000E barrier coat epoxy primer. They recommend 4 to five coats above and below water line. This product is also used on fiberglass. The bottom is sanded with 36 grit, cleaned with air pressure or new brush to keep contaminents down. The 2000E coat is applied within 60 minutes of cleaning. I can do two hours between coats depending on temp and humidity. Here in N. California I am hoping to get it finished in one day start to finish. Max time for curing two weeks. Have you heard about this epoxy? Then I'm applying 4 coats of Trilux 33 bottom paint. Let the experiment begin. I'll haul it one year from finish and try to remember to contact you with results. :>)

About time you cleaned up that old barge I've done it a few times it feels good to have a tidy boat. Good luck with the rest of it.

It appears that it's the patches that are holding the boat together. Love your videos. Greetings from 10 km away north.

Nice to see you guys drinking water for a change stu.If this cold snap keeps up you'll be drinking tea and coffee.Good job you blokes did on the hull and tell Dave if he wants reliability to get rid of that defender and I'll give him my Hilux.lol. Keep up the great work mate.

Crack touch up with a Dremel wheel might have paid dividends. Just a thought, clean out with minimal hull loss.

A really enjoyable and educational vid...Thanks😊👍

PPS: If you blow through put a piece of copper on the back side to act as an argon well and also to hold your puddle. By turning the cleaning action up you are decreasing the penetration which is what you want on that thin material as well as cleaning the impurities with the ac action.

Hey Stu I found a lump of 4 by 2 timber a metre or two long was easier to use than the scraper scraping the barnacles off the bottom of the boat. Just hang on to it with two hands at a similar angle and use it the same way. quicker and easier. doesn't scratch the metal or existing anti-foul as much. Thanks for the video it was good demo.

Not that it matters too much but you can get 'Extra Large' Flanged Pop Rivets in stores they really do a good job of fixing plates and the like to secure a really strong repair, might come in handy...

Grinder and paint makes me the welder I ain't!!

great video stu!

Good job buddy!

👋🏼 from W.A🦘with an alloy hull I’ve found it’s much more sustaining, internally & externally when a marketed acid is systematically applied, rather than attempting to encapsulate electrolysis. 🤔💭

Braising with map gas and ally rods works well as long as you heat the base metal and not just melt the rod

Been a while since I have done TIG welding but some tips for next time. Preheat your area with a heat gun, doesn't have to be radically hot but at least warm. Vee out the crack to minimise impurities and make sure you drill the ends with around a 3mm (1/8th") drill to lower the chance of it spreading. A backing plate on the other side of the hull may have helped (just some mild steel plate pushed up behind the area you are welding) to spread the heat better as you weld. In your case you appear to be correct, your amperage was too low and so you were getting poor penetration until you upped the current. De Havilland hulls are notoriously difficult to weld well (they were mainly riveted) so you did a good job for your first go! PS: A detail sander makes for a lot easier sanding between strakes and chines. Etch primer on bare metal is a must.

Nice work. Painter's tip: Never dip your brush straight out of the can. Pour into another container and dip from that. You'll end up with a lot less "foreigns" in the coats of paint.

Great video, have you ever thought of using raptor liner? Thank you

Another great video, thanks. Any reason the primer and/or anti-foul couldn't be sprayed on? Or is that way more work to get right viscosity? RichE

We had a Ali assault craft at work which was pop riveted together and all leaking or most of them so I cleaned the hull back to bare metal and fibre glassed the whole thing finishing with flow coat worked a treat and lasted for years. Cheers Jeff

will do, hope your pretty detailed with the two stroke rebuilds haha, although you have been very descriptive with your other videos

I'm painting parts of my aluminum boat with some interlux products which I'm pretty sure are the same as your using. Definitely some nasty stuff! Should last a good long while though. Thanks for the vid

Lacquer thinner is the best for cleaning aluminum before tigging.

Hey dude, I've got to say I'm loving all of your boat maintenance videos! Especially as I'm a Newby to boat mechanics. I really like the design of the green machine and was wondering what is the name of the hull shape? keep up the awesome videos :)

Love your videos (I’m from Aurora, Ontario, Canada). I have a question about painting an aluminum boat. I have a 19 ft aluminum fishing boat that I use only in fresh water lakes. The above waterline two tone paint is getting a bit rough looking - mainly a lot of scratches. I assume I would lightly sand and remove any decals. Would I need to use a primer? Is there a aluminum paint primer? Do I need to use a special kind of paint for painting above the waterline. Can you recommend a brand or the right type of paint to use on aluminum (above waterline). Thanks, Paul

just a mild suggestion. can get car dolly casters to move it around in the future.

I wonder if an oscillating multi-tool would be better for barnacles.

Aluminum that is old and has been painted as well as in salt water will be dirty which I am sure you know. So when you weld it be prepared to weld beads and then grind the entire bead out. You might have to do that two or three times but each time you are removing the impurities. Marine aluminum is most likely a 5000 or 6000 series so using 4043 rod will wet out more easily and solve a bit of your problem on that. It isn't nice to work with but it can be done. Take care. Doug

Did you do a video on making the aluminum dash? I’ve been looking, but no findE?

Hello Danger Marine! This might be a stupid question. I have paint worn on my lowerunit so that aluminiumoxide is visible in form of pits and scratches. I took highstandard, industrial stainless steel paint that i had laying around and sprayed over it to cover up the problem earlier mentiond. Now i'm wondering how the light coat of paint will react with the aluminium?

Do you have to use anti fouling paint on boat thats not staying in the water all the time ,or is single pack paint ok

with your tig welding you want to start the puddle on some good aly and make sure you angle your tig across the piece and not into it then you cna use good heat and push the puddle from good aly across the gap rather than having tow puddles contaminated fighting each other, there's nothing wrog with too much heat if you ahve plenty of filler. :)

HI next time you antifoul mix the hottest chillie powder into the paint it works 100% have now helped on a boat from berowa waters home of the bottom fouling greebles and after the fist time was close to zero on the bottom . Warning do not allow the paint to land on your skin, it burns with the chillie powder in it , we did it on a hard stand at Brooklyn The boat a large timber xgame fishing boat

I think a respirator is important, there is living organism living on the shells of paua also known as abalone with can be fatal if breathed in ?

PS: set your cleaning up to about sixty or seventy per cent and try a few different settings on the machine until the weld edges are showing that hew that shows it working.

How well does liquid tar work overtime in the ocean?

bbq bush might have worked good

Why not prime the whole boat?

Funny here in the US International is lables Interlux

wondering what sika flex number you used for the large hole repairs in the boat

If you get all that off you’ll be able to do about 10 more mailers per hour 👍👍👍

what grit sand paper should I use with electric sander on Aluminum boat? After that I use self etching primer then paint over correct?

All it needed was a good sandblasting.. and it would be as good as new.. and provide a good surface for the epoxy to bond

Always use etching primer when painting aluminum. Or You're paint will not stick

as far as your welding of the crack, I would have first tried just an arc and no filler rod seeing as it was very thin and not much gap

Hey dangar, would you recommend buying a aluminium 15ft boat with a hull thickness of 2mm ?or is it too thin in the longrun ?

This assistant is dressed to work hard!

I am pimping a similar dehavalind 16footer. What did you do at the bow, the rubber is perished on mine. This ship has not been in water for 31 years!

Might want too also consider attaching a sacrificial anode to boat such as piece of zinc, it will corrode before the aluminium. With the welding, might be worth practicing a bit before. RU-vid has .a goldmine of information on it, you also probably need an all purpose filler rod as well if you don't know what type of aluminium your welding.

Sweat the aluminum with a torch... heat the aluminum..not red hot !.... just enough to wick out the moisture ....then weld...itll help

let me know what to look for as far as wear and what measurements need takin to know if the block or parts are still usable, you know what to look for when it's screwed.

umajunkcollecror toying with the idea of using pickup truck bed liner like Duraliner. But trucks are painted steel, not aluminum. Fresh water lake Erie, boat is usually trailored. I have an old cheap canoe to experiment on before I mess with my 50 year old Starcraft. cheers or jeers. Don

Hi mate...is that a Yamaha 40 CV in the background ? is it dead or still kicking ??

so I got the boat back here to Florida, sad to say very poor compression. I got 100 psi in three cylinders, 30 psi in two and 15 psi in the last, she's deff gonna need some work

what brand of Aluminum boat is this please ?? and old clark boat or a stacer / Quintrex ???

yea I haven't torn it apart just yet,

Good job...is that an old Dehaviland Stu ?

Why didn't you undercoat the sides and paint them too?

Flex seal it flex seal does work I have used it my self keeps everything nice and dry

LOL I think you meant "scrape" the hull, as you did not haul it to the "scrap" yard

If you have a crack really should dig out it out just make sure you got clean metal and so you get the whole crack

I am wondering why you didn't use the car hoist and a simple rope sling off the extended arms to lift the boat off the trailer . That would have been both safer and simpler. By the way, when do you do any customer work to pay for all the stuff you use :-)

welding rod needs to be 5356 your boat is 70 to71 mod

Am trying to find an email link to you. I have drawn up a circuit you may be able to use as an add on section for your anchor/nav lights vid.

having never worked on boats, my question is, why didn't you just paint all of the boat, why tape it off at all. just wondering, enjoy your videos!

I've been in the paint job for 45yrs ,take it from me ,all bare surfaces should be etch primed never mind what magical properties of epoxy and other so called cure alls,there is no substitute!!!regards an old pom from blighty !.

I've had fiberglass boats, apart from a small fishing boat as a kid which was aluminum. Why are aluminum boats the choice for where you live, and in turn, why are most smaller boats (16+ feet) in states fiberglass? I assume it's a weight:cost ratio but I was curious what your thoughts are. With the corrosion issue with aluminum what is the argument against fiberglass?

an old 15 ft dehave ////// 300lbs hull ////paint must be right for alloy or you will have white patches over boat ///boat made 1970 to 78

NEVER !!!!! Remove the cap and dampen the rag. !!!!!!! You can contaminate the entire can. !!!!!!! Loosen the cap and dribble it on the rag .28 years ticked auto body . Remember George Castanza from Seinfeld - NO DOUBLE DIPPING. !!

drinking worm milk after sanding will help your lungs evacuating that dust

Zinc chromate primer, the most awesome primer you will ever use. en.wikipedia.org/wiki/Zinc_chromate

Add a warning about picking the right anti-fouling paint. The wrong kind, metallic, turns the boat into a huge battery, that eats itself in short order.

I have always said there are thinkers and doers, by the time the thinker has sussed out the best way to do it the doer would of done it. Don't overthink it.

You should mask up with that shit bud. Full face respirator with proper filters. Nasty stuff.

If you have trypophobia your going to want to skip to at least 7:25

🙈

should have took that boat outsided in the first place to scrap it.

What you don't see is pourous That's why I think soda blast and then west system of exopy that is heat driven into the aluminum. Your anode, I didn't see one. That means your boat is the scarficing the aluminum, making it pourous

should of paint strip it faster

So after all this work only three years later the boat sank again and the cracks were as bad as ever. In hind sight you wasted you’re time it would seem

Did someone give you this boat, I hope you didn’t pay for it

ar its got to be clean u got shit on the inside run a thin cut off wheel in the crack

Shoulda just sand blasted the whole boat

Should of left it hooked up, smooth floor easy drag unloaded trailer - too much of a hurry, again I have to do the hole herd yet again