blistered paint on top of forks

radiation man

both my trek bikes have started to blister at the top of the forks, were the brake caliper bolt goes through, anyone know if i can get the proper colour spray for them

sungod

if the paint is blistering there may be corrosion going on under there

i'd take off the calipers, give it all a clean, use some fine abrasive to take off the bubbled paint and check if it's just cosmetic or if there's any sign of deeper trouble - galvanic corrosion can damage aluminium pretty fast, especially if spray from salted roads gets in there

try a place that does touch up pots for cars, should be able to find a close enough match

clean, paint, dry, then grease the mounting bolt/nut/etc. before refitting the caliper