Xypex is a good idea for your countertop but really for its crack
healing ability. Xypex will heal the small cracks that form in your countertop over time. These cracks, while small, may still allow liquids to penetrate and perhaps go right through the concrete slab. Xypex will react with the water that gets into the cracks in their early days and heal them against further water penetration or through leaking.
Xypex will not however shed water or liquids from the very surface of the concrete. The sealer or epoxy you discuss is a good idea to protect the concrete from staining or etching.
Xypex addition would not be expected to hinder the application and adhesion of other coatings or liquid treatments to the surface of the concrete. Xypex will not adversely affect
the ability to colour the concrete.
Xypex Admix (what I expect you will use in this project) is NSF -61 approved for use in concrete used in potable water applications and potable water holding structures are a common application for Xypex products. We have found that normally this is an acceptable guide for gauging a materials acceptability in a food application and Xypex products are used in food processing plants.
I trust that this satisfies your needs on these topics. Please call me – Jim – 604-273-5265 if you have any other questions.
Posted on 11 Oct 2017