Metal Finishing for Sharp Corners:

The Military Specification MIL-A-8625F, Table III, offers some recommendations for the radius of corners for inside or outside…

If the coating thickness is:

0.001 inch
0.002 inch
0.003 inch
0.004 inch

Radius of curvature should be:

1/32 inch
1/16 inch
3/32 inch
1/8 inch