The problem with having the lining done elsewhere is that it would either be on top of the final lacquer coat and at risk of getting worn or damaged, or you would need to get lining and lacquering done by the second supplier which would be extra cost.
The problem with having the lining done elsewhere is that it would either be on top of the final lacquer coat and at risk of getting worn or damaged, or you would need to get lining and lacquering done by the second supplier which would be extra cost.