Discuss BAL Prime APD on Cement Board - Dilute or Not? in the Tanking and Wetrooms Forum area at TilersForums.com


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I’m about to tank Hardie Backer cement boards using the BAL WP1 waterproofing kit. I’m a bit confused with the Prime APD. Should I just paint this straight on, undiluted, or should I be diluting at all? If I do need to dilute, what proportions?



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Screeded floors need diluting 1:1 but I remember Bal being a bit funny with their installation instructions regarding WP1. At the stage at which I stopped using their system, they wanted you to skim the Tile backer board with tile adhesive and priming/tanking once dry.

This was ten + years ago so might be worth contacting their tech team. They’re usually very good.


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Probably best if I ring them to get a proper answer, but I suspect that dilution will be required as the boards are cement-based.