Incredible How To Seal Chalk Paint On Metal References. You can even use chalk paint on rusted surfaces with great results. You can also opt for polycrylic or polyurethane to seal chalk paint by lightly sanding the surface, applying a sealant in thin coats, and letting the surface.

Spray sealant is the easiest way to seal chalk paint. Wet a sponge or cloth with water and squeeze out any excess liquid. Protect your paint, chalk paint and wood.