What colour undercoat for dark red gloss

WLM21

I am going to paint a garage fascia board with this dark red paint

I have already primed the fascia with white primer, now I need to undercoat it.

I think grey should be OK ... advise if not

I do have some of this grey undercoat in the house

Will this be OK ?

or would I be better off just painting two coats of the gloss
thank you

Mr.Generous

Grey undercoat will be ideal, if you use white you will probably need 2 coats of dark red for even coverage. It's a solvent based gloss so use a bristle brush rather than a man made one and lay off the paint for a great finish. Wilco paints I've used have always been fine. The Leyland undercoat will give a great base and it will probably look good in grey mat before you top coat.