powder coating tips
09-28-11, 06:59 PM
#26
I need to correct the info on the timing issue. You start the cure timing when the part reaches the cure temp, not just when you put it in the oven.
Putting parts into an already hot oven can cause trouble depending on the material. Cast aluminum parts that have been anywhere near oils need to be baked about 20F hotter than the cure temp of the powder, for at least 20 minutes, even up to an hour because the oils will leach out and ruin the powder job.
Buy some of the hightemp tape for masking and silicone plugs to fill threaded holes.
Putting parts into an already hot oven can cause trouble depending on the material. Cast aluminum parts that have been anywhere near oils need to be baked about 20F hotter than the cure temp of the powder, for at least 20 minutes, even up to an hour because the oils will leach out and ruin the powder job.
Buy some of the hightemp tape for masking and silicone plugs to fill threaded holes.
Alright so if I heat the item with the powder while preheating the oven and then start the cure timer when part reaches temp. (I have a laser thermometer) it'll turn out the same? When I started this I just planned on doing a few of my own pieces but the more I discuss it with friends the more it seems I could profit from them...at least enough to cover the cost of starting this up and maybe a mid sized media cabinet. So I should be ok with the wire wheels for now. Thats a nice oven ill be following that just in case I can turn a profit. Things gota be a lot better then mine..I get a single rim during my Test fit which will slow things down a bit. And thanks for the bit about the oils didnt know it would suck up that much
09-28-11, 07:26 PM
#27
Once you learn how a few different parts heat up you will be able to make a close guess as to when to start timing. Thin parts heat up quickly, almost following the oven temp if you start off cold. Thicker parts need time to catch up, I've had large parts need over 20 minutes to get to temp.
The powder is pretty forgiving of being over baked and the cure profile is actually a slope that takes longer at a lower temp and continues to the stated cure temp. They may say 15 min at 400 but you can usually cure that same powder for 20 min at 385 or so. If the cure temp is 400 I take the oven to 405 or 410. Spend $40 on a good t stat from Auberin, the dial system on a home oven sucks for holding correct temp. Look on ebay or go here http://www.auberins.com/index.php?ma...b60bcd01b4fdac
Under curing is a bigger issue than over curing, if in doubt, add another 5 min.
The powder is pretty forgiving of being over baked and the cure profile is actually a slope that takes longer at a lower temp and continues to the stated cure temp. They may say 15 min at 400 but you can usually cure that same powder for 20 min at 385 or so. If the cure temp is 400 I take the oven to 405 or 410. Spend $40 on a good t stat from Auberin, the dial system on a home oven sucks for holding correct temp. Look on ebay or go here http://www.auberins.com/index.php?ma...b60bcd01b4fdac
Under curing is a bigger issue than over curing, if in doubt, add another 5 min.
09-28-11, 07:29 PM
#28
Get your powders here. Start reading in the forum, there are guys that have forgotten more than I know and they are pretty helpful.
http://powder365.com/store/
http://powder365.com/store/
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