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Flex-seal


Flex seal sticks extremely well to whatever you put it on. The question is will the plywood hold together? If you paint the area where you plan to put the flex seal with an oil based primer to bond the plywood fibers it will do much better.
 
Keep one thing in mind when you do your project, regardless of what you choose to seal with.

If your sealer is in place to keep water out, it can also hold moisture in.

You might be better off using a deck waterproofer, THEN seal the edges.
 
I bought a can of the stuff in an aerosol can. Worst product I've ever tried. It not only didn't seal it made it difficult to use other products. I have to assume the rest of their stuff is bad too.
 
The caulking is the stickiest stuff Ive ever used, and for your purpose would work better than most others. Its not the easiest thing to smooth out, but a deer blind doesnt have to be pretty.
 
(quoted from post at 17:44:21 09/11/20) Any good? Need to seal seams on a plywood sided box
blind.something I can paint over
Click to expand...
I tried the clear Flex-seal on some cracks in concrete that was letting water through. It worked for about a month and then it failed. Also this clear coat turned yellow from the sun.
For your purpose I would go with silicon.
 
It seems most people are giving feedback on different types of Flexseal products that will be used here, but I suppose it would be good to clarify which one you had in mind. The white caulking is some sticky stuff, and what I assumed you were thinking of. Its far better than plain silicone.
 
Ive been using a sealant called Geocel for years, and it's never failed on anything I've put it on. It's a roof tile adhesive and comes in different colors, but the black works the best. Roofing Supply should have it, and comes in caulking tube.
 
I've tried the stuff on a number of things and so far it has NEVER worked for more then maybe 30 day and that was if I got lucky. It is only good for wasting or your $$
 
I'll throw this in to the mix. A tape called Zip Tape. It's used in new construction to seal seems in plywood before siding. It's a little pricy, but when applied correctly, it's a bear to get off. Scott
 
I grew up on the coast and we used to undercoat our fenders to prevent rusting. Auto undercoating is still sold for less than $3 a 16 oz can. I use it on my roof to seal cracks here and there to seal small seams and any place I need a rubberized sealant and it is appropriate.

On any product, you have to ask yourself, if it failed, was it the product, or did the product to which it was attached yield? I built a boat when a teen and was looking for a good adhesive. I found a purple marine glue that the seller said was first rate. I was using Oak framing so I took a couple of scrap pieces and applied the adhesive per directions.........the glue didn't yield, the Oak separated from itself and part of it was still attached to the adhesive. I do notice that most adhesive directions insist on application to a "clean, dry" surface. I have a rubberized, white roof coating that specifies the brand name of the soap to be used and how to use it for pre-cleaning roof surfaces, prior to application of their product.
 


Texasmark1 provides a good explanation. The stickiest material in the world can adhere only to what it is put on. put it on thick dust, it will stick to the dust and the dust will come off. This is why primer paints are used.
 
I was thinking about using some of the flex tape to seal some pinhole leaks in a above ground pool. I watched multiple videos of others trying the same thing and flex tape promptly failing. If that is any example of how terrible their products are then I dont want any part of em!
 
I'm with Old....tried it several times and a total waste of money. I wish there was something out there that worked like their demo commercials. I'm interested in the replies to see if someone has found something it is good for.
 
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