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I have used JB Weld to fill holes many times & painted over it with no problems. Never had it crack or fail & it doesn't damage surrounding paint or warp the panels. Just dimple the hole slightly & tape over the back if accessable.
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I need to do the same repair as pete pete. Both front and back fiberglass was on on mine. Is your JB weld on the hood or roof? Concerned about heat and expansion/contraction up there. The other option is lead. I have fiddled with it before. It works great, but you must neutralize the acid after tinning or rust will form under paint. Without access to the back of the repair to repaint etc. there will be some rust with weld or lead.
I have used JB Weld to fill holes many times & painted over it with no problems. Never had it crack or fail & it doesn't damage surrounding paint or warp the panels. Just dimple the hole slightly & tape over the back if accessable.
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I need to do the same repair as pete pete. Both front and back fiberglass was on on mine. Is your JB weld on the hood or roof? Concerned about heat and expansion/contraction up there. The other option is lead. I have fiddled with it before. It works great, but you must neutralize the acid after tinning or rust will form under paint. Without access to the back of the repair to repaint etc. there will be some rust with weld or lead.