Can body fillers be used on bare metal surfaces or should an etching spray be used first to give a better key?
Thanks
P38 type body fillers
Oct 04, 2007
3 Replies
Fine on most bare metals. Use a coarse abrasive paper to give a better key.
Always on bare metal, never on the paint. There's no advantage applying filler over etch primer although acid etch won't suffer from solvents because its not a film as such, only an etch.
The main reason is when filler is sprayed over the solvent can seep under the filler softening the paint which will lead to a heavy ring round the repair, (called a fried egg) or poor adhesion.
Stephen.
Best on a bed of newspaper (and chicken wire if structural) isn't it?
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