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.

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.

does not drip when applied on vertical surface.

Bought this 10 oz POLY SEALANT in the color: STONE. The grout around my electric fireplace crumbled and this color matched the stone surround to fill in the gaps. Was rather thick and hard to clean up using soap and water so I Used a rubbing alcohol based product to cleanup more easily. Time will tell if it is durable enough to do the job. 4 stars because of difficulty to clean up and packaging hard to read.

My spa waterfall stone was coming apart. Water was lifting the top cap, used this and no more problem (for now). Urethane works great with water. Let it dry for 2-3 days for a great seal.

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.

Sealant was hard in tube and could not use it. Unfortunately the return window expired and I was unableTo receive refund

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.