Hi,
I'm doing a skinning project on a fuel tank...
I've layered up several layers of resign prior to wet sanding,
My problem is there seems to be losts of places where I cant sand deeper, that are filled with a white residue, when I wipe down with water or acetone they disapear but come straight back once the surface is dry.
I know if I layer over the residue it will just stay there oviously ruining the red/carbon effect...

How can I get rid of them?
I think that the whiteness is just the residue of the resine that has been sanded, but Im having a real problems getting rid of it so I can do more clear layers.