A
adrian bond
Take the unopened gear back to Topps & get them to swap it for a BAL spf slow set.
Tell them you told them that the addy had to be compatible with a tanking kit.
You can buy a slow set addy at ScrewFix but I'm not sure which Mapei one they sell.
is this the one you mean? Bal Single Part Flexible White 20KG | Topps Tiles