Does anyone know how to "set" the chalk on this layout? I used regular sidewalk chalk on black cardstock. I rubbed it in - but it is still not "set". I know as an art project as a kid we'd spray it with hair spray - but I don't think that will work for a layout. The pictures are not adhered yet - so I can spray it easily enough - but not sure what to spray it with. ANYONE know?
Thanks for any help!