New Waterproof Duct Seal Repair Sealing Clay 6 Pack White Moldable Silicone Putty, Quick Mending Mud for Pipe Connection, Wall Hole, Air Conditioning Holes

It works

easy to form & smooth

If this stuff is supposed to be waterproof I don't know when. Water melted it when applied to a wet surface it just disolved. I don't even have an idea of how this is supposed to cure if it ever does because everything is in Chinese If someone else wants to try this junk I will send it you you if you pay the postage

This product is impossible to use right out of the package. It’s like wet dough and will stick to EVERYTHING.(Photo1) Either freeze it for about an hour or expose it to air for a couple of hours. (Photo 2) I used it to patch up a hole in the corner of an outdoor shed. (Photo 3) So far, so good. We’ll see how it dries out over the next few days.

I needed to modify a woodworking dust collector to support a canister filter. I had to make a wood donut out of plywood to insert into the top of the collector frame to separate and support the filter. The donut had to be sealed to prevent air and dust escaping back into the shop. I used a silicone caulk fill the voids from the top but could not use it to fill the voids from the bottom. Hard to reach with caulking gun and while the silicone caulk was still somewhat in a liquid form would tend not to stay in place. It was recommended to use a moldable silicone putty for the bottom side of the donut. The downside is there were no instructions and no safety precautions in the packaging. Or at least none in English. I rolled the putty on a stone cutting board using nitrite gloves. This stuff sticks to almost everything so I had to use a separate pair of gloves for each package. Using my fingers I pushed the putty in between the wood donut and the metal frame of the dust collector. It stayed in place. I won’t know for sure how well it worked for a few days until I complete all the modifications on the dust collector and test for air leaks but it looks promising and has worked in videos I saw on the internet.

Does the job but remains soft

easy to mold into any shape, you can press it in any crack with your fingers. I'm using to seal this up for a waterproof house on the coast of Florida.

Item does not work as good as advertised.