- put the pieces in an electric fan oven at set to 50 degrees C (120F) to pre-warm them.
- oven started cold, and I only left them in for 10 minutes throughout the process I am describing. I would not do this with resin or thin plastic bits (swords etc).
- I took each piece out, sprayed it, and put it back in again.
The longer version.
I had sprayed the guns for my Crimson Death (which are magnetised) with dullcote a while back. It was cold and humid, and I got the dreaded frosting. This was a bit of a downer, and it has taken a while for me to get the drive back to tackle the job.
The guns are mostly black with green gems. I repainted over the black, as it was quick (I had just painted black and edge highlighted), and the frosting stood out over the black worse than the green. My gems have a 5 step highlighting process that I could not be bothered to do again. The black came out looking shiny in places and matte in others, so really needed matte varnish again.
Warming and spraying again worked well. It made the black matte, and on the gems that I had not repainted, it actually removed the frosting. I can only assume the solvent in the dullcote re-dissolved the frosted layer and this time dried properly because is was warm and the humidity was low. I imagine that if the original frosted layer had been too thick, this would have been less successful. These gems were frosted, and this is them after the fix.