Basecoat waterproofing too strong

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Suzanne12

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Hi, the basecoat on my render is too strong and its not letting topcoat grip and stick. The topcoat keeps sliding off and im at wits end, any advice to get topcoat to stick would be greatly appreciated!
 
wind up.
if it properly scratched how can 4mm top coat slump?

I think OP said sliding.

We had it with Sika over 20 years ago, very waterproof albeit insufficient key - too light.

Stippled it with 1 to 1 and 1 to 1, sbr, water, sand, cement.

Let that set, no probs.
 

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