- White 2-component epoxy primer for fibreglass, aluminium, and wood above and below the waterline. Prevents blistering (osmosis). *Provides effective protection against water diffusion in the laminate. *Suitable as a primer for polyester, epoxy laminate, steel, galvanised steel, aluminium, and stainless steel. *When mending more extensive damage and cracks, or when levelling cavities, epoxy filler must be used first.