I understand best practice and the need to cover myself if something gos wrong so I think I will be going Mapei primer and SLC and adheasive even though i have enough leftover tilemaster primer and adhesive for the job (DIY ) the problem is the SLC needs to be outdoors spec and tilemaster dont domone and I don't see any other tiling jobs I need to do so the all tilemaster I have will be binned but what about grout can I use my tilemaster grout with mapei adheasive.