MasterSeal NP1 10.1 Oz. Polyurethane Sealant, Stone

I have used this twice. First, I installed a modern awning above an exterior door and to prevent water coming through the small gap between the awning and the wall it was attached to, I used this sealant. It worked great! It completely stopped rain from running down the door. So I tried it again. This time to fill the gaps between a flat linear shower drain and the tiles surrounding it. Again, it sealed the area completely and water from the shower now flows down the drain with no issues . Before, some water was going into the crevices left by the tile installer. Problem is, as other reviewers stated, the material is thick and requires some prep work in order to achieve a clean outcome. Yes, have lots of paper tissue or rugs available. You will be cleaning your hands/fingers all the time. Yes, have blades from a utility knife available to clean any excess. Don't forget to use painter's tape to protect the areas you don't want to have this sticky material on. And, specially, work slowly. Be patient. The thick material is not entirely a bad thing. It will allow you to shape things as you need/want. I required a 45 degree angle for the water to flow from the shower flow into the flat linear shower drain and the thickness made it easier. If you are a detailed-oriented person, you are going to like this product.

Excellent product and superior quality

Excellent quality.

Works good

Water was getting into my basement. I used this between my foundation wall and sidewalk. There was about a quarter inch gap between the two. It stopped the water from seeping between. My basement is now dry. It has last at least two seasons. WARNING: It is thick! At first I thought it was all dried up. No, it was just that tick. You will have to have very strong hands to squeeze the caulking gun. But it is worth it.

Very good at sealing expansion joints in my pool but very hard to get smooth. I would recommend watching several U Tube videos on how to apply.

I’m not suggesting you use this product between all your crevices on your patio. I had been having issues in the gaps between my retaining wall and travertine tile outdoor patio. I put in high quality polymeric sand. Got soft and fell in. Ok. User error. I dug it all out. Not an easy task. Tried again. Next spring, same issue. To make a frustrating problem short, I put on my thinking cap and found this sealant. WUH HOO!!!!! After digging out the old sand, I applied this. Smoothed it with a popsicle stick as it’s not water clean up. It looked great. STILL looks great after a year. Water flows down into the center drain. Viola! I’m so thankful I tried this polyurethane sealant caulk. I hope it’ll work for you too.

I had a water stain on a closet ceiling and feared it was from a leak in the shingled part of my roof. The roofing company I called sent an inspector who examined the area and felt it was a deteriorated seal around a bathroom vent pipe. He recommended this product to seal around the pipe and we were able to do the work ourselves. The seal has worked well.