What type of primer would go for pre primed mouldings

For water-based paints you do not require another coat of primer but if you wish to apply primer, we recommend Dulux precision maximum strength adhesion primer. 

For oil-based paint a suitable primer must be applied prior to applying the topcoats. We recommend Dulux One Step Alkyd Primer/Undercoator Zinsser Cover Stain Primer Sealer)