Whitelightning and guys...if i undercoat the hood and chasis with rustolium...what colour should is use?

If you use a black ...won't it be hard to see
any new rust forming rather than if you use a
lighter colour such as grey or choacoal grey?

On my 88 chevy van the factory colour is greyish under the chasis...i would think this would allow you to spot any rust forming earlier?

Your input appreciated

Starrider