I am having trouble getting consistent results while applying matting powder to my recently painted platinum Silicone casts.
Sometimes they look evenly matted and nice, other times they have white streaky areas.
I've been painting a very thin layer (as thin as possible) of clear platsil gel-10 diluted down by half with naphtha. Immediately after coating the cast, I take a fan brush and brush on the Fuse FX Matting powder. After 5 minutes or so I force-cure it with a heat gun and then rinse off the powder about 12 hours later.
My question is: What is the proper matting method? Am i not using enough clear coat? Should i wait a bit before brushing on the powder in order to avoid the white patches?
this may help
Hmm. Initial thoughts are that the powder is getting mixed in with the silicone and therefore not washing off. I think you need to let the naptha evaporate before adding the powder. In other words you are rushing it a bit.
Apply the thin clear coat. Leave it for a while, until it has lost the naptha, then apply the powder and force dry.
I think perhaps you are still using to much silicone.I have not used this technique but all you need it to barely get a the silicone(think of it as if you sprayed a thin coat on the surface to tack the powder to) See how he hardly puts the silicone on.almost looks like nothing is being applied
Definitely agree with Greyguy's comment. The only reason for the thin coat is to get the powder to stick and create a rough surface (by which I mean micro indentations that reflect light inconsistently and therefore dissipate 'shine'). Less is more!
Good stuff! Looking forward to seeing the final results!
As a matter of interest, naptha seems to evaporate very fast, and 40 seconds seems about right. You could basically leave the silicone until it starts to set off, but that might be risking not getting all the powder on, so something around a minute seems good.
I have been trying out d-limonene as a solvent (better for one's health, and smells nicely of oranges). This appears to retard the setting of Platsil to about 12 hours or so. At any rate, I leave the painting to set off overnight. And it doesn't evaporate anything like as fast as naptha, still seems to be there hours later. But it does the job of thinning the silicone to allow it to be painted on.
So... for long paint jobs the d-limonene is the ideal thinner, but for fast work the naptha does the job.