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So I painted my army using Testors paints, and it looked great. Naturally I wanted to protect some of my best models. I bought some Purity seal and followed the directions to the best of my abilities, but the Seal gave them a powder white, frosted look. The model I wanted to save them most got it the worst. Is there any way to save this? A way that maybe doesn't involve stripping the models down to the plastic?

Honestly, no.

I am afraid you got a bad can of matte varnish. They are very sensitive to temperature. i left a can in the hot garage once and it ruined it. Left one in the car in January. ruined it.

Best thing to do is get a can, keep it upside down, and give it an honest 5 minute shake. I'm serious. 5 minutes of shaking is worth the fourteen/eighteen hours you put into the squad.

The white is excess matting agent.

If you wet the model (brush on a little water) the white may (if it's not covered with a thick layer of varnish) disappear. If this is the case then you can apply a coat of gloss and then matt down after that.

Otherwise you need to get the varnish off which unfortunately will mean stripping.

The best solution is to airbrush your top coats using a reputable varnish. Purity seal (tm) is the devil's own groin juice*.

*: in my opinion.

I used to use Purity Seal and was fed up with getting the same frosted look as you have unfortunately experienced. I've now replaced the spray can with Humbrol Matt Cote brush on varnish which, although it obviously takes a few minutes longer to apply, doesn't give me any frosting problems.

As for your existing models, I was able to reduce (but sadly not eliminate) the frosting by applying a gloss varnish to the model and then applying the Matt Cote to dull the gloss down again. I've heard that something in the gloss varnish helps to dissolve the Purity Seal and, as I say, it seemed to work for me to a large degree.

Also avoid Armory (matte). I'm with winterdyne... airbrush varnish is far superior in providing food, consistent results.