I usually add a lot of reliefs on my prints. But as you may have noticed, it's hard to spray paint reliefs : painter's tape is a pain to apply in that instance.

I found a really great brand of oil-based pens that do the trick really well as you can see below (before/ after). Took me 2 minutes to apply. Then wait a few hours for it to dry completely.
IMG_20160306_163338.jpgIMG_20160306_163825.jpg

I really like these new products from Pebeo.

A few remarks :
- the oil naturally seems to want to follow the layer lines and slightly seeps if your paint application is a bit too generous. So when your relief is on the side when printing, you need to be careful.
- I have found that applying a spray paint coat before completely avoids this seepage.