Don't worry about that stuff, that's just factory glue and sealer that was haphazardly done! Just wipe down the floor, and stick down the Dynamat.
Btw, that floor is immaculate!!!! I, as well as others who've done floor pan repairs are jealous of that pristine metal!!!
Btw, that floor is immaculate!!!! I, as well as others who've done floor pan repairs are jealous of that pristine metal!!!