As above . Good work Geoff made me realise I should be doing test' s on stuff I'm not sure about rather than relying on hear say or propaganda from manufacturer's.
Good to see that people care about what they do. However, unfortunately it can and does take months for some reactions to occur. I have worked for Impey (But prior to Waterguard). I have seen when reactions have occurred resulting in a thick Black tar coming through grout and ceilings. Trust me. They put installation instructions in with the kits for a good reason. And of course there is the guarantee to consider. Divert from what they state at the cost of it.