not to hijack the thread, but cleaning the fabric may be a good idea as it probably has some fuel residue. I have a lot of experience in the auto paint field, and this seems like a big concern, if you want it to last.
I have a similar issue, but on the belly. prob is i have some oil/soot penetration, so for me to get ANYTHING to stick to it, i'd have to clean the fabric.
any experiences/ideas?
isopropyl alcohol, or something mild like that?