Hello! If you want hatching effect on model then you can prepare special UV mask (for example in red channel) that cover all places you need. After that just add some base color blending node in Material Editor and connect alpha with this mask.
You can use material functions to configure shader effects and blend them as additional layer with your main material. To calculate on which regions you should blend effect you can simply use some simple mask texture. For example take a look at this: 1- Layered Material, 2 - Created Material Instance, 3 - One of MF for that Instance