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Hi,
I got some frosting after a varnish on a mini. I notice it dissapears if I wet it, but comes back up ones dried.
Is there a way to remove the frost permantly?

Frosting that disappears when wetted is a surface issue and can potentially be fixed.

A brief explanation: The varnish surface is covered in thousands of microscopic pits that reflect light in all directions rather than one. This is why it looks frosty. When you wet the surface all of these pits get filled in with water creating a smooth surface allowing light to reflect off of it in just one direction.

How to correct: You need to make the surface smooth, but permanently. Apply a gloss varnish to create the smooth surface. You can then reapply the matte varnish.

How to avoid in the future:
1. Make sure climate conditions are appropriate (e.g. medium humidity, medium temperature). Check the can instructions for details. Shake the hell out of it for a long time (I recommend at least 4+ minutes of shaking.
a. Medium humidity - if humidity is too low, the varnish will dry mid-air and land on the model as tiny, hardened grains;
b. High humidity can cause varnish adhesion issues which leads to a cloudy look.
2. Medium temperature - temperature extremes can have negative effects on varnish behavior). Do NOT start or end a spray on the model (e.g. start spraying to one side, pass over the model, end spraying away from the model).

The way I correct it is to get some white spirit onto a cotton bud, dry it a little with a paper towel, then rub the frosted part away softly. Once dry, reapply varnish in affected area in more ideal conditions.

I've seen solutions that included using vegetable oil in the past. I tried it and it just left me with greasy marines.

Yeah either remove it with spirits, or cover with a light coat of gloss then re apply the matte.

Light passes are key. The varnish shouldn't form a thick solid layer or pool on the surface. Do a couple of light passes. That's all you need. The can should be mobile and spraying before it passes over the model