Sump paint?

[SteveOS3]

Just replaced the engine mounts after realising the sump was resting on the anti-roll bar and think the sump could do with a coat of paint as it's got a fair bit of surface rust.

I don't think the sump comes out easily as the cross member is in the way but want to paint it over; what's the best type to use? Will stone-chip peel off when the engine heats up?

Cheers,

Steve

[SteveOS3]

I've got hammerite smooth lined up to go but wondered if there was anything better.

I've been looking at your removable crossmember, is it a threaded plate that's then welded onto the chassis?