A vital part of the preparation process, the correct primer, sealer or undercoat will help ensure the colour uniformity, opacity and durability of your paintwork.
Some sources will tell you that a preparation coat is never required, but, this is not always the case. There are many surfaces where a preparation should be used if you want the top coat to perform at its best.
Acrylic Sealer Undercoat
Water-based convenience
Maximum adhesion to interior surfaces
Provides a smooth finish over jointed plaster board
Excellent hiding power
Easy to apply
Oil Based Primer
Use on interior and exterior bare timber
Available in pink. (White in Queensland)
Suitable for enamel and acrylic top coats
Stops tannin stains, even over tannin-rich timber
Excellent adhesion to timber
Sealer Binder
Seals porous surfaces
Binds powdery surfaces
Provides a strong foundation for top coats
Protects against alkali attack
For interior and exterior use Seals water stains
Sealer Binder
Seals porous surfaces
Binds powdery surfaces
Provides a strong foundation for top coats
Protects against alkali attack
For interior and exterior use
Seals water stains
All Metal/Steel Primer
For all metals except zinc and galvanised iron
Enhanced rust protection
Contains no toxic lead or chromate (toxic pigments)
Top coat with either water based or oil based products
Galvanised Iron Primer
For zinc and all galvanised surfaces
Great adhesion to galvanised iron
Enhanced corrosion protection
Protects against white rusting
Contains no toxic lead or chromate (toxic pigments)
Top coat with either water based or oil based products
Finishes 
