Waterproof Sealant Mastic, 2025 New Repair Sealing Clay Wall Gaps Filler, Quick Mending Mud for Drain Connection, Wall Hole, Air Conditioning Hole Waterproof Seal Putty (0.06 pounds/Pack) (3)

Found this to be amazingly easy to work with ! I used it very haphazardly (cause I'm old, unskilled, and female) to a) seal a gap in the wall under bathroom sink around pipes to block the Zillon bugs i imagined crawling thru there and the b) to seal a leaking shower sprayer connection - both attempts made me very happy- despite my ineptitude. It works !

Works well to seal gaps. Easy to use, and seems pretty durable/long lasting. The price is alright, and it drys pretty quickly.

Product as described. Worked well to seal a gap under kitchen sink. Would purchase again.

For filling small cracks this putty is pretty good.I cut the corner off the package which let me squirt out a bit on to my finger. Comes out like a ribbon that way. Very convenient!It feels weird. Sort of putty like and sticky but doesn't stick to fingers for some reason, and tacky after application. After an hour or so it gets a bit rubbery.I haven't filled any big gaps with it. It says it may crack if you try and fill a big gap. I also haven't painted it yet, but it takes a good long day to get dry and cured.I wouldn't use it to fill holes in sheetrock. It's too rubbery, and doesn't really support any sort of drilling or sanding very well.And it would plug a small leak in a bucket, but... not under any pressure.So this is useful stuff to have around, but you gotta be somewhat selective where you use it.

This stuff is great! My contractor and I have multiple updates going on simultaneously in my home and this is quite useful! Easy to use, good durable seal. We used it for plumbing, drywall and on the windows. Get some and dont forgeet you have it. It’ll inevitably become invaluable and you’ll be glad you happened to have it on hand. A great value! I gave a couple packets to my contractor to keep in his work vehicle.

It is so easy to apply and definitely stopped the air from seeping in through my window. Not a lot of mess like caulk. If I needed to, I'd buy again

This waterproof sealant mastic is perfect for patching holes, sealing pipe gaps, and preventing leaks. With its high plasticity and strong adhesion, it’s an excellent choice for both home repairs and waterproofing projects.Very easy to use: just open, knead it a little to get some consistency, then apply

Bought this sealant clay to use on shower faucet to fill the gap between the faucet and the wall/tile. Taking it out from the packing is not easy, it is very fluffy but you have to kind of knead it. Then you can put it where you want and smooth it with your hands fingers etc. I also used wet paper towel to smooth and it worked well. I would recommend this waterproof sealant.