Hi I have a question about a sculpture I’m working on- advice would be very welcome! I’ve built a sculpture from pine strips that I have then coated in regular wall filler to create a textured surface. I plan to keep it the white colour of the dried filler but plan on adding some small details with my airbrush. The problem is the filler is quite crumbly on the edges and delicate in general, and I was thinking to coat the whole thing in a slightly diluted PVA/ water mix to try and strengthen the filler coating without changing the colour. If I do this will that be a suitable surface for airbrushing onto? I am using Vallejo Model Air acrylic colours, and just small details , no large flat colour. As I am not sure the exact ingredients of the Model Air acrylics I just want to make sure they are ok to paint onto a surface coated in PVA? Many thanks in advance!