I know this is 3 years ago. I wish you had included the standard old white Styrofoam ( I think some people call it bead board). I'm wirking on a Rv storage bay door and need to glue the 1/16" filon fiberglass to the white Styrofoam. I know liquid nails Fuze*it will work but hoping to use a spray adhesive. Thanks for posting this.
Pl300 works great. The trick with these poly glues is adding moisture to aid in curing. If you put a bunch of glue between big pieces, it gets cut off from moisture in the air and won't cure.
One other issue with the Spray adhesives!!!! That glue will play hell with machining. The glue will melt and adhere to your machining bits, blades etc. The FOAM will not
Correct answer is Foam Fusion. Original Gorilla polyurethane Glue works well too. So does Epoxy. Anything with acetone in it will eat up the foam. If you want to use something with acetone, you must first prime the foam with water based acrylic paint.
Dought you watch this comments any more being so old. How did you get the bottom of the bow angled up, I learned you can’t heat it up with a flame damn what a mess I had. And sanding takes forever. How did you do it?
Would hv been nice to tell us what you costed the damn boat with before glassing it. Stryafoam melts with resin in it. Make a good video but don’t tell us shit
None of these are particularly good adhesives for XPS foam. Builders of foam and fiberglass airplanes like the Rutan Long EZ have been using a slurry of four parts epoxy to one part microballoons for this job for decades. Needless to say, they don't want their airplanes to come apart around them in the air...and they don't.
Will 3m 78 stick to an old fiberglass panel? Glue insulation to a truck fiberglass topper cap? Or should I use great stuff to glue panels to the cap?And fill gaps. I want to use some type of spray adhesive to stick fleece over the insulation. A carpet alternative.any suggestions on what to use?
Im 0:03 into this video. And i see You are Missing 3M 78 Therefore, its not a good polystyrene foam-bonding video. Because that contact adhesive does not melt Polystyrene. And it creates a bond thats approximately the same strength and flexibility as the foam. You can barely just peel the foam blocks apart, after sing 3M 78, with some moderate damage to the foam. And it doesn't expand and push the foam apart like Great Stuff and Gorilla. But TBH none of these options are structural. If you need strength and longevity, use EPOXY and Glass Microbaloons.
Tried similar test myself , Gorilla makes many glues, that spray in your test has solvents (fail) . Gorilla Glue Original is a similar Urethane glue to Great Stuff, but doesn't foam (as much) Both are moisture activated ( they don't need Oxygen , they need the water in the air to cure). I used it to bond 2 sheets of Xps .
Remove the moisture barrier (plastic) or the adhesive is useless. It must be foam against foam. if there's a plastic barrier then the adhesive isn't adhering to the foam.
Thank you so much! People online were talking about different adhesives for styrofoam for RV's ceiling and 3M will definitely fail eventually due to erosion.
I use 5 min epoxy glue with both blue and pink foam. Agree with the previous comment that it’s the strongest. But it is expensive. I tried using wood glue but it would not dry properly and was not strong. I have also laminated carbon fiber to foam using epoxy laminating resin. You could use it to join two pieces of foam and it will be cheaper than epoxy glue, but takes longer to cure. At any rate epoxy is definitely the way to go.
Way over built. the next time you decide to get creative and build a foam core boat. you might want ot check out the guys from Vietnam that are on RU-vid and watch how they use foam board to build boats you might learn a few tricks if your pay attention.
Love your doing this! Suggestion only...light metal plate with 4 threaded studs sticking up "layered" into the design then has foam over it a few layers also...seems a good sturdy seat mount idea is all...going after this myself this fall! Thanx for the inspiration!
