ok dude,
paint flakes off metal for one reason only, bad prep work!!! if you have paint "chiping" well nothing you can do you drive the car is goin to happen
but if it`s just coming off then it`s bad crappy prep work
same thing if the bumper bad prep work
oem gm bumpers come with primer on them,that`s fine,the process is, scuff with a red scuff pad clean with dx330,use a flexable sealer,base,the the clear HAS TO BE FLEXED
unprimed bumpers are totaly different means raw plastic
you take hot soapy water and wash the bumper until the mold agents are gone if they are not and bumper is still waxy feeling,then it has to be cooked at 165 degrees for 30 min`s
then use a adheshion promoter that has to bond for 30min`s then flex sealer base flex clear
now iam goin off of how i have been doin it for the past 10 yrs and using ppg products
metal prep/new panels
new panels:
allot of prepers think that you can just scuff the e-coat with a scuff pad and than paint right over it<<<WRONG!!!
even tho ppg say you can do it ALWAYS use a sealer so the base coat has a chemical bond to the metal
the way i prep new metal:
da 320, clean with dx 330, sealer, base with dx57, and then clear
again ppg dbc system
i think that`s pretty much covers prep work if ya need more info feel free to ask
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