Device installed to help keep Trump's Reflecting Pool clear of algae was never used on a pool: report

[lonely bird]

10. OK

Hybrid polyureas are materials that utilize a blend of polyol and amine.. A pure polyurea uses only amines. Hybrids most certainly can be formulated to resist the impact of water.

The claim that pure polyureas are resistant to moisture during applications centers, imo, around the set times which can be as fast as 3 seconds. This does minimize the reaction with moisture but it also can result in failure to wet out the substrate which can lead to poor adhesion. In addition, if a substrate such as concrete contains water a polyurea will have potentially have adhesion problems. Therefore, primers are recommended in such a situation. Many times they are epoxy primers.

Other factors such as surface preparation and the application method come into play as well. Preparing a concrete surface to an ICRI CSP5 and higher can result in micro fractures of the concrete which can cause less than satisfactory adhesion. If the spray equipment is off ratio or the material is not sufficiently heated then problems can occur.

My issue with the choice of the material is that it is an aromatic. Aromatics are not UV stable.