Hey,

I don't think what you see is blush--it really looks as if there was a very slight amount of fuel residue present when the dope was applied. Blush does not usually show up as white as you have here.

The area to be painted MUST be VERY free of fuel residue or it will turn white just as you have seen here.

You may have to sand the bad dope off, clean with 90% or higher alcohol and try again.

A clue is that the problem seems to exist near the fuel fittings---.