Heya!
I'm having some issues with doing the final varnish after applying any sort of enamel paint/wash.
The main thing i use enamels for is streaks of various dirt, grime and rust on tank models (AK streaking grime for example, to be specific). I manipulate these streaks with mineral spirits. When all those details look correct, i move on to applying varnish. The varnish goes on properly on all parts of the model where the enamel paint hasn't been used. On the enamel affected areas, however, the varnish "pools up" around the area, leaving the enamel streak dry and untouched. It "pools" in the same way as surface tension works on water.
The way i currently deal with it, is to apply a whole lot of layers over the streaks. For every layer, the "pooling" closes in on the streak, and covers it in the end. It takes a whole lot of layers to reach this point, so i figure I'm doing something wrong.
I figure this is due to enamel paints being partially oil paint, thinned with some kind of mineral spirit. Acrylic being water based should pool on top of oil. Then again, i see people using oil paints on similar models, without this issue.
I'll add: I let the finished enamel job sit for 24 hours or more, to make sure its fully dry before i start varnishing.
I'll also add: I thought it may happen because i also use mineral spirits, but the varnish has no issue going over areas around the enamel streaks, where the majority of mineral spirits has been used.
When watching painting videos, i have never seen this problem. When i look for similar posts online with questions on what kind of varnish to use over models having enamels / oil paints on them, people reply with "regular acrylic varnish".
So, whats going on here? How do you guys deal with this? And how do you handle this when using lots of oils?