The Motorspray 'Stone Guard' product (from the tin, not pressure pack) is a water based product. The manufacturer (Hi Chem I believe) state that it is compatible with ANY acrylic paint.
YEA RIGHT!
The stone guard went on really well, and gave an excellent texture - exactly what I wanted. I followed all instructions to a 'T' and ensured that EVERY product I used was compatible -
as per their instructions.
After 3 months, the gloss finish coat, applied over every area that I had applied Motorspray Stone Guard, had 'cracked' and 'crazed'. The reaction was NOT immediate, and took 3 months to come through the top coat.
I spoke with one of their sales reps, who got Hi Chem's NSW Sales Manager to call me and have a chat.
He said that because it is a water based product, it does have 'issues'. He promised to come and have a look at my car with one of their lab technicians.....but of course that was just B.S....because he never got back in touch with me.
The sills were done in a pressure pack can, of a European brand 'stone guard' product. This was bought from elsewhere, and I have had no problems with that product.
Moral of the story is - Don't use a 'certain companies' water based product. It is pure cr@p.
I am off to the Hunter Holden paint shop (great guys who know their paints) to try and find a product that will isolate the problem areas, then I can reapply a much better stone guard product.
You live and learn......that's all I can say.
**These comments are 100% factual and I stand by what I have said**