I am wanting to spray on coats of water-based polyurethane to a painted wood surface using a HVLP Spray Gun. The painted surface already has textured particles added into it to improve slip-resistance. I'm wanting to add polyurethane because I'm afraid that the texture will slowly chip away without a sealing coat on top.
I've read that you need to sand down the surface between each layer of polyurethane to allow for better adhesion, but I'm afraid that sanding the textured paint will ruin it. Any tips on how to resolve this?