Hi guys, I'm in a similar position to atom, I'm new and I'm trying to airbrush onto 250grm card using Createx low tack masking film and an Xacto swivel knife. I found out the hard way about applyng the right amount of pressure with the knife but the paper still rips when I remove the film. After reading this thread I went to a few art shops in Glasgow looking for 'clear coat' but I didn't really know what I was looking for and neither did any of the shop assistants (the usual response was, a sharp intake of breath followed by - "I wouldn't do that if I were you...". Is 'Clear Coat' an American brand name? Is it specifically for primimg card/paper? Where can you buy it - Art stores, DIY stores? Will Com-Art paints adhere to it? A friend has also tried to help by giving my a blank canvas but I don't know if this needs to be prepared in some way also.
Lastly, how long can you leave masking film on? I watched Dan Nelson's Youtube video "Part 5 Cutting the frisket" he cuts every piece out first (which must take hours) then he removes an intricate piece of cut frisket, airbrushes the work then replaces that piece and moves onto the next.