Paul, you've got me thinking about the acid etch, when I bought my paint pack I explained what it was for and bought on the suppliers recommendations, including etch primer, a trawl of the net finds a mixed bag of those in favour and against. I think now. A test spray on a hidden piece to see how it reacts may be worthwhile, would like my paint to key but not at the cost of strength to the grp.
I don't think I would remove what you've applied, any damage would have been done by now wouldn't it?
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