Rustins Quick Drying MDF Primer is a water based primer for use on indoor and outdoor work. Used as a primer, it is suitable for new and bare MDF. It has high opacity and can be used as an undercoat on primed or painted surfaces. This primer may be over-coated with water or solvent based finishing paints. Available in white or grey. Rustins Quick Drying MDF Primer is a grey, water-based primer for all interior and exterior surfaces. It has a high opacity with low odour. Suitable for use on MDF, hardboard and wood. Sizes available are 250ml and 500ml. 1 x Rustins Quick Drying MDF Grey Primer 500ml.