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you should not use the gravitex over bare metals .
you will want to prime with a primer made for bare metals .
i don't use spray can products so i have no idea what will work for a direct to metal primer in a spray can .
you may want to use upol's acid 8 on the bare metal . but check with upol to see if you can go over it with the gravitex . they may tell you to spray some of the high 5 over the acid 8 and then spray the gravitex . the reason they may tell you to do this is the acid in the acid 8 may delaminate the gravitex if you just spray over the acid 8 ??????
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