I spoke to Lester Engineering, their refurb process consists of; bead blast, paint spray and lacquer. They don't powder coat wheels.
NuLuk's process consists of ; chemical strip, bead blast, powder coating, paint spray and lacquer. They said they have found that a powder coat lacquer provides the best life span on diamond cut wheels.
The price of a std refurb has increased to £340+Vat.
Appears to be a more comprehensive process, but its very expensive.
lr