Weldwood Contact Cement 

I’m having to do a few minor repairs to my 8 year old kayak which has had parts come off due to the original adhesive degrading, and per the manufacturer will need to use Weldwood. Your video was very informative. Thanks for sharing.

Solvent based tips. 2 coats after first is dry. No j roller. Smooth a piece of poplar with softened edges. Hard pressure from middle out. Better pressure

Thank you very much Sr. Your video helped me a lot!!!!

Good video and it confirms my thinking that the water based is a loser. I've been using the solvent based for 40 years with no problems. I hope I can solve my current problems now by buying (hopefully) some solvent based and apply over the dried water base. Never again going to use the water based IF I can find the solvent based.

Your well-ventilated garage has a gas water heater in it.

The water based adhesive need longer drying time than solvent based adhesive. And, the water based adhesive is also problematic on MDF as it will quickly absorb the water. So drying time is even longer. When the work is small, the amount of VOC solvent released is not an issue. It is an issue on industrial scale glue up.

Cool thanks Ken

I used the water based stuff because at my location I can't get the solvent based (rural Alaska, $$$ hazaed shipping etc). My advice: don't go straight to your project but have some scrap pieces and PRACTiCe first. This can work very well but is really touchy. What I found: if you wait till it's "tacky", as in still sticky but no longer wet, it is too late. It won't stick. This is what it says to do on the can, but it is misleading. I guess "tacky" needs to be better defined. This is water based, so there has to still be some water in it to bond. The best time is when it is no longer runny, but still moist enough to leave a fingerprint and a bit of residue on your fingertips. Then it will stick nicely. Apply several layers (I used 3 layers on plywood, two on the formica, in short succession while still wet), use lots of pressure, weigh it down for about a day until it is bonded and make sure to pay attention to the temperature (above 65 F). When I did all this while applying formica to plywood for my countertop, it worked very well.

Furthermore, it's the solids content that makes the adhesive strong. So for example: 3M 90 is stronger than 3M 77.

I have to laminate a countertop in my garage so the gas water heater must go offline. Need to flush it anyway so this a good time to kill the pilot light. I'll use the water based version once this gallon of cement is used up. Hate the smell. The main disconnect for gas in backyard.

Raspberry jam is better than water based.

Used water base on plywood for years have had no problems.

You probably needed two coats looks like you put way more solvent based on with that roller

what type of roller cover do u use on the solvent based? I used a micro fiber cover and the glue dried almost immediately and started pulling off the fibers on the roller cover.

Hi shout-out, can the original contract cement solvent weldwood glue a basketball sneakers?

Any method of thinning ?

Water based sucks, I tried it on leather it was useless

Water based calls for 60 minutes curing, no?

Not a very good test…I noticed you actually put two layers of the solvent base vs one layer of waterbased and as someone commented, you used more glue using the roller.

think watered down white elmers glue and i think you have what is in the green can. garbage in my opinion and use.

Um. Water IS a solvent, no?

Ok