Ill give you what I can on "low temp powders" most places dont even carry low temp powders (they carry LowER temp not low temp if that makes sense) you can get powder that will cure out at around 225* but its limited in colors and limited in where you can get it just like high cure temp powders are very limited in colors---
I was just on the phone with prismatic earlier and they dont carry low temp powders at all now the lowER temp I said above as an example some cure at 340 some at 375 some at 400 415 etc you get the idea-- PBTP has a simigloss black that can cure out at 280---you can cut temp a little lower and drag out oven time a little longer but even that has a cut-off point
another example my personal bike is getting a lot of blue parts on it the lowest I can take that blue to get a full cure is 350--(thats a 400* cure powder) I have some Tuscan flat black the lowest I can cut that to is from 375 @15minutes to 330@25-30 minutes
the blue going on my bike flows out at approx 230* -BUT just because the powder has flowed out dont mean its cured--- the powder will not be very durable --think of it like this >>you just added an egg shell to your part
Below is a test part I did today (blue as said above) did all the prep like it was a normal part, got the part temp to approx 250* and let it sit for 20 -30 in the oven-- let cool---the pitted marks are from hitting the part with a pair of regular pliers (not really that hard either) you could actually scratch it fairly easily to-- the center of the pitt mark is where the hit happened the area around that is where the powder "popped" off BUT notice one hit free end of the part LOOKS just fine---now this is by no means a perfect test of things but more of a rough version I did because I wanted to see what would really happen
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