aluminium corrosion treatment

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This stuff looks good, I just ordered 2 x 32oz bottles.

Question.

I have lots of bubbles of corrosion, do I clean it up first with sand paper then apply or just apply it over the bubbles/paint?
I just want to slow it down till I am ready for a re-spray.

Thanks.

the corrosion has come from the back to front blistering the paint. Steel to aluminium contact is the problem. any surface treatment will not stop it,it will reappear
 
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