V-RAY DECAL on CURVED SURFACES NOT WORKING

Hello everybody!

I am currently using V-RAY decals and have experienced some problems whit placing them on curved surfaces. I have tested the same decal on plane and curved surfaces and the same time and it renders only the one on the plane. We have to recreate a very damaged volt and it would be extremely useful to be able to use the Decals.

Does anybody know how to solve this problem?

Thank you in advance!