Originally Posted by mwoolfso
Sealant over sealant is OK but if you are going to put something like BFWD on as a second coat then it makes me wonder why you have M21 at all. :-)
I have M21 because I was just trying something different before a car show later this week. Having tried that, now I'm thinking I maybe should have stuck with what I normally use. So my question is about how to proceed...typically, I wouldn't be doing this.