Use Plastic Padding as in spite of the others out there claiming this and that, I reckon it gives the best contoured finish, and is so easy to work with. Very rarely do I use any pinhole stopper when I 've used PP, just a fairly heavy primer/filler undercoat, then do a local blow in, with an airbrush, yes you have guessed it,

: Silver Boots No.17 Glitter


Then just a good clear lacquer. Glasso at the MO'. Love doing the wheel scrapes, keeps this old geezer spouting?
