I'd be cautious about thinning too much, or exposing it to aggressive chemicals before it's had a decent cure time. I think I was guilty of both, and had a model go a bit sticky on me as a result. (This was a diesel model running Klotz Benol as a lubricant - I suspect that there's something aggressive in Benol, as it's affected a couple of finishes that ordinary castor wouldn't trouble.) When I took the unusual step of following the instructions, I found I could still airbrush the KBS when thinned only 15%. Applied as per the instructions, it seems impervious to just about everything. When I tried to remove it, I had to abrade it, as neat acetone had no effect. A great product IMHO - thanks Mike.