guzma393
Active Member
Sure I can bring you a block to try out.
Powder coating
- Thread starter Archeryrob
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Archeryrob
Undecided on a great many things
What is the highest humidity anyone has shake and baked powder coating? My hard rule was under 40% and I made bunch of 1/2 and 1/2 9mm hollow point bullets and can't get the humidity lower than 45% now that it got warmer. Maybe when its gets colder next week and the wood stove is going again.
I have done it at 50% with fresh paint powder. It seems to me, the older the powder, the less humidity you need.
That could well be... I don't have any 'fresh' powders, so mine are a bit aged. though pretty well sealed up for storage, but I agree with Rob, much over 40% and I try to avoid it. I may have done it successfully at slightly higher, but I'd say 45 is about tops for me with what I have on hand.
Archeryrob
Undecided on a great many things
Humidity got to below 40 so I tried to powder coat some 147 grain (155) hollow points for 9m. I wanted purple so show different and bought Eastman Grape. It wouldn't stick work a crap. Tried it on ice cube trays and it wasn't enough on it to flow to cover. It also stick to non stick aluminum. Another fail. Tried spinning 5 for a second coat and not enough stuck to make it work. Disappointed with this powder.
Then I did red and that stuck fine. Tried the ice cube trays for rifle bullets and it looked good. See pic 2366 and I am not impressed. I for winds on some from the trays the sizer will crush and flat spots the sides made.
Threw the last bunch and crappy purples in to the red and spun them. I could hard tell which ones were purple. Nothing was as easy as the wire basket. These stuck together something awful and might need a second coat. I got bare spots from the wire and them sticking together and pulling off the coat on another. Maybe I should have shook them and they had too much powder?
Might have to get the silicone mat and try that.
Then I did red and that stuck fine. Tried the ice cube trays for rifle bullets and it looked good. See pic 2366 and I am not impressed. I for winds on some from the trays the sizer will crush and flat spots the sides made.
Threw the last bunch and crappy purples in to the red and spun them. I could hard tell which ones were purple. Nothing was as easy as the wire basket. These stuck together something awful and might need a second coat. I got bare spots from the wire and them sticking together and pulling off the coat on another. Maybe I should have shook them and they had too much powder?
Might have to get the silicone mat and try that.
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Archeryrob
Undecided on a great many things
I tried again today. I tried the purple as I watched a video and a guy used silicone spray. Powder would not stick, swished bullets in another tub with spray and those bullets in the tub for shaking with the other bullets and they all stuck. I tried it and partial sticking, then I put the silicone lubed bullets in the powder stuck to together and removed even more powder from the bullets. Complete failure and worse than plain. Some one on FB said they had failures from every Translucent Powder coat they tried!! I may try wet coat with it, as I have it and can't use it otherwise.
Then I tried green, which works. Thinly coated, but not enough. Tried a few silicone bullets and the powder stuck together again. So, I washed a lot of bullets tonight and wasted some powder and time.
later this weekend I will try heating the bullets before shaking to see if it sticks better. If not, I will buy some acetone and try the wet, two coat method. The humidity of the house has been way to high to try dry shaking for a month and a half.
Then I tried green, which works. Thinly coated, but not enough. Tried a few silicone bullets and the powder stuck together again. So, I washed a lot of bullets tonight and wasted some powder and time.
later this weekend I will try heating the bullets before shaking to see if it sticks better. If not, I will buy some acetone and try the wet, two coat method. The humidity of the house has been way to high to try dry shaking for a month and a half.
I have a small dehumidifier that I keep in a small basement room. When I want to make powder coated bullets, I turn the humidifier on until it gets to 40-45% and then I shake. I do also rub the plastic container with a ball of siran wrap and I think that helps to make a static charge.
guzma393
Active Member
I been rolling and rubbing a plastic container i got from the dollar store along a carpeted surface to gain static charge. I keep my powder coat in a smokeless powder jug. I also always add a bit of fresh powder coat into the excess mix whenever I do a batch it seems to help with "priming" the excess mix to stick again.
Archeryrob
Undecided on a great many things
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