cure time and temp

[kmajka01]

hey everyone,
have a quick question about curing the powder. I know that you are to follow the manufactured specs.for time and temp. but no one has ever told me that the part it self has to reach curing temp and time to cure. any info on would be greatly appreciated.

[fl70]

You pretty much summed it up.
Bring the part up to cure temperature (verify with a no contact thermometer)
then start the clock for the recommended cure time.

[JTW37]

What he said.

[donafams]

is it better to run the oven temp up past the cure temp to get the part up to the cure themp, then back it off, or just set the oven at cure temp and wait?

[holeshot87]

i start the curing time when i see the powder starting to flow on the part. it works for me.

[donafams]

ive seen it start to flow on my cast steel part as i was spraying, and the part was about 260deg, after i pre-heated it, and the cure temp was 400...

[holeshot87]

i have alway did it this way. i cure it 1 min over the cure time. i have never had a problem doing it this way. a person i know who does this for a living told me this. so i try it and the powder coating jobs i have done have all came out fine.

[donafams]

Originally Posted by holeshot87

i have alway did it this way. i cure it 1 min over the cure time. i have never had a problem doing it this way. a person i know who does this for a living told me this. so i try it and the powder coating jobs i have done have all came out fine.

yea but when does the actual cure time begin? thats more difficult for me to fugure. a heavy cast part, like the tranny case i just did may take an hour at 400degrees to become 400degrees itself but the powder has been flowing long before that time. So when would you start the clock?

[mikmj]

Originally Posted by donafams

yea but when does the actual cure time begin? thats more difficult for me to fugure. a heavy cast part, like the tranny case i just did may take an hour at 400degrees to become 400degrees itself but the powder has been flowing long before that time. So when would you start the clock?

When the part reaches 400*..........

Mike

[donafams]

even though the oven temp is 400 and the powder is flowing alot sooner than the part itself reaching 400?

is it ok if the powder starts to flow 15 to 20 minutes before the part finally reaches cure temp, and then let it bake another 20 minutes?