Andrew Mawson wrote:

I think it is no more than getting them ABSOLUTELY clean and hot
dipping in molten tin. Certainly this is how bearing caps are done.
The problem is the cleaning to chemically clean bare metal - possibly
you could sand blast them ?

AWEM

Thanks AWEM
Would have to be chem clean as they have a small rolled edge that would
be difficult to blast clean in the crevice where it meets the mould
side. I have tried cleaning in a strong caustic solution and achieved
visible removal of carbon, grease etc. Is that sufficient?

No flux?
Would the item be dipped cold, or preheated?
As it is for food contact, does it require pure tin?

Appreciate your help.

Cheers
Spurtle