Highcraft Windows use Berger premium Prep primer by DULUX
It is a multi-purpose preparation paint for use on interior and exterior surfaces
It is a Water based product
Dulux specifies to TOP COAT the Primer, (Berger Triple Coat) within 30 days of exposure
Highcraft Windows specifies to store all your un-Primed and Primed windows & doors away from Rain, Dust, oils, moulds, Wet Concrete. **We also back Dulux recommendations of Top Coating within 30 days of delivery
Before top coating make sure the surface is of sound quality and prepared properly, Dry, Sanded & Cleaned.
Highcraft Windows recommended the use of a Water based Top Coat for External exposure. But always ask advise from your professional paint shop.