Im about to apply my 4th layer of latex and im tinting this one fleshy. Im going to airbrush some minor features on it to give my skin some depth. Im going to add a 5th layer to finalize my suite. My question is do i have to seal the airbrushed paint with perma-wet on the 4th layer? Or will that paint be fine since its getting layered over and just finalize the 5th layer/final paint job with perma-wet; or must all paint be coated?