I'd try to remove the spots before repainting, very carefully using a cotton bud and a little diluted solvent. You can re-paint when that's gone wrong!
Looking at my various colour charts of model paints, I'd start off by trying something like FS.x6495, which is about the palest un-tinted grey that's readily available. FS.x6622 is another possibility, but still be prepared to mix in a little white.
For an explanation of Federal Standard paint codes, see HERE. There are loads of other more recent colour conversion charts on modelling websites, but this is a very good place to start, and has stood the test of time well.
Looking at my various colour charts of model paints, I'd start off by trying something like FS.x6495, which is about the palest un-tinted grey that's readily available. FS.x6622 is another possibility, but still be prepared to mix in a little white.
For an explanation of Federal Standard paint codes, see HERE. There are loads of other more recent colour conversion charts on modelling websites, but this is a very good place to start, and has stood the test of time well.
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