You can use S50 on the underside like you would a primer, followed by, ideally, 2 coats of UB.
It worked well on a former 306 and that was rustier than my 75.
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[SIGPIC][/SIGPIC]
MODS DONE;
plenum spyhole, bonnet cable divider block (previous owner), chrome wing mirror covers, gold fan resistor (previous owner), s/s bumper bolts, uprated under tray fittings
silicone intercooler hose, Viton O rings, Crofts door finishers, boot badge, wood dash, Phil-t4's magic wand, wood wheel, mk2 repeaters, HK tweeters & Angel eye projectors.
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