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personally I do not believe in using a product like Ospho and using it on outer surfaces .
in fact I don't really believe in using products like this much at all .
most products like this will put a clause in some where that will state that the finish could peel from it's use .
I would 1st read the products TDS and other info to see if it states that if so then remove every bit of it and then media blast the spots .
grinding or sanding will not remove all of it so forget that idea as just one little pin size rust spot will come back on you .
if the area is not to large then you could go buy a little hand held spot blaster the cost for one is like 35 dollars . then for about 10 bucks you can get a 100LB bag of #000 fine sand from your area masonry store .
by blasting it you will be removing it and not trying to cover it with hopes that it will not came back and screw up all your hard work .
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