581 Waterproof Coating, Cement Based, White, 50-Lbs.
MasterSeal 581 White(formerly ThoroSeal) is a portland cement-based coating for concrete and masonry that provides protection against water, dampness and seepage. Mixed with MasterEmaco A 660, MasterSeal 581 creates a low maintenance and highly durable waterproof barrier that is NSF certified for potable water applications.
- Waterproofs and protects building interiors from dampness, moisture, or seepage.
- Ideal for interior or exterior, above or below grade; vertical, overhead and non traffic bearing surfaces.
- Fills and seals pores and voids to correct surface irregularities.
- NSF approved (white or gray products), use in potable water tanks.
- Resistant to mold and mildew.
|Country of Origin||US|
|Manufacturer Name||PRIMESOURCE BUILDING PROD.|
|California Residents Proposition 65||www.P65Warnings.ca.gov.This product can expose you to chemicals including SILICA, CRYSTALLINE (AIRBORNE PARTICLES OF RESPIRABLE SIZE), which is known to the State of California to cause cancer. For more information, go to|
Rated 5 out of 5 by Frank K from Masterseal 581/Thoroseal White masterseal 581 is definitely the same as the original product Thoroseal. High quality, easy to mix and apply. Highly recommended, and the 50Lb bag is the best deal.
Date published: 2020-07-21
Rated 1 out of 5 by Clumpy from Well, the jury is out.. While I love the product, I got a bag of rocks. I sifted through the rocks, and the 50# bag had 15# of clumps. I did weight what I had so I could add the appropriate amount of water based on what was good. True Value has offered to refund my cost, but I have yet to see the refund come through. Hopefully, this review may speed up that process. The store has offered to order me newer product, and I still need that, but it has yet to come in.
Date published: 2020-05-08
Rated 1 out of 5 by sbrenner from Ended up with defective old stock The bag was full of hard chunks of thoroseal. Must have been stored too long in a moist warehouse. Had to run it through a blender. Very disappointing experience. No response from customer service.
Date published: 2018-09-30
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