What is a decal layer?

A decal layer is an optional special type of TGA file can be used to accompany a custom paint file. Because they allow for transparency, decal layers are particularly useful to stamp another layer of decals on your cars, separate from your primary paint.

Decal layers should be uploaded as 32-bit TGAs with an alpha layer mask hiding the parts of the decal layer you don’t want to cover on your primary paint.

Your decal layer should also match the dimensions of your primary paint (2048x2048 or 1024x1024).

Can I add a spec map to a decal layer?

No, iRacing does not support spec maps for decal layer TGAs, only for the base car paint.