Never seen that before ? Did you key the area up first or anything ? Are you sure it's on the inside of the shell and not something that's happened to the outside while the mask has been on so you couldn't notice it ?
Have you got any spare lexan ? If so paint the liquid mask on that, the same amount as you've applied to the shell, let dry out, remove a section of it ? Is it doing the same ? If so paint on that area with a colour you want to use on the shell ? Does it still show ? If so I guess you could remove the whole lot, wash the shell again, start again or just risk painting it anyway ???
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