Don't miss part one of Kerrie's (aka Antikva) great advice on shrink plastic buttons. Here is part two ! The higher grade of yellow/white sandpaper you use for sanding your shrink plastic, the better and don't try a sander, not even a small one ROFL! It tends to be patchy as it slides too much, has to be hand sanded. I wipe down the plastic sheets with a clean damp cloth after I've sanded them to make sure I've gotten rid of any dust. They do look slightly scratched or scuffed after sanding but when it shrinks you can't see it even if you've used pastels or pencils, as long as it looks fairly smooth. I wear thin plastic gloves as fingers leave grease marks and affects the colours for both the pastels & pencils. Watercolour pencils don't have that problem once you've swished the colour around. I have used acrylics thinly but didn't really like the effect, but of course others might and of course they can use just sharpies but not ...