System three advised no scratch coat when I emailed them about problems I had with using their Clear Coat product over krylon clear in the past. It does adhere to createx well (i.e., it won't peel) although fisheyeing is, as you mentioned, a curse with the stuff. The propensity to fisheye seems to vary by manufacturer batch and by the color of the createx you are putting it over (black and purple are bad). I try to do dark plugs near the end of the batch as the stuff thickens up. If you use a wide fine hair brush it does much better than something like an acid brush (you can clean the good brush in alcohol and reuse).
Washing everything (cups/stirrer/brush) with alcohol first helps. Don't use medical syringes, they have some sort of silicone coating that causes fisheyes. When I finally get off my a** and build some plugs again I plan to try their Mirror Coat with a added flex agent (don't try plain Mirror Coat as it will crack).
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