Blackfriar Undercoat - Grey

Yes, Blackfriar Undercoat is suitable for exterior use on metal, provided the surface is prepped correctly and free of rust.

The grey tint is specifically designed to help block dark colors, making it easier for lighter topcoats to cover in fewer layers.

Refer to the drying time on the product tin; generally, allow the undercoat to become touch-dry and cure fully before sanding lightly and applying your topcoat.

Blackfriar Undercoat serves as a primer-undercoat for most surfaces. If the surface is highly absorbent or problematic, a dedicated primer may be used first.

This product is solvent-based; please ensure adequate ventilation during application and use white spirit for cleaning.

The surface was likely not cleaned or sanded properly. Ensure all grease and loose particles are removed before re-applying.

Check that the surface is not too hot and that you are not over-working the paint. Apply in thinner, even layers.