bostik primer coming off when scrapping feet on

None of the gritty none porous surface primers form a skin of any sort. No matter how you apply it, from my experience, but as said above. Bostik isn’t a reputable brand to professionals!
 
Yes, you can scratch off, but not peel off. The force of tile adhesive and tile onto the primer is not gonna pull it off
 
I would be tempted to remove it.......then dilute 50/50 and make up a slurry mix. Powdered tile adhesive and diluted primer...........diluted enough to brush. Then leave to dry.
 

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