>>7018477Any acrylic clear coat like Pledge. I'm using pic related with brushes. You could spray it but you might want to mask off all the other bits to avoid messing with joint tolerances.
You will have difficulty brushing on the first coat since it's going onto raw plastic/foil. The advantage of this rustoleum one is that it comes thick, so the viscosity helps the first coat stick onto the surfaces. The subsequent coats are thinned with water to prevent brush strokes. I do with 3 coats in total.