OK, so after a lengthy chat with someone from Classic Motoring Accessories/Proper Auto Care, they claim that Blackfire Compound is *far* more abrasive than SIP and were horrified at the thought that the two products were perceived as interchangeable.
So what's the deal? Weren't there some on this forum who have used the 2 products interchangeably?
So what's the deal? Weren't there some on this forum who have used the 2 products interchangeably?