Forum Register Members Casino Live Posting Feed Garage Arcade Members List Calendar Search Today's Posts Mark Forums Read
Go Back   The Chicago Garage > The Garage > Automotive Discussions > 3800 Discussion

User Tag List

Like Tree5Likes
  • 3 Post By Mattstrike
  • 1 Post By cap42
  • 1 Post By Frank Dukes

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 08-01-2018, 11:55 AM   #1
Random Crazy Custom Car guy
 
Mattstrike's Avatar
 
Join Date: Feb 2014
Posts: 270
Casino cash: $6490400
0.14 per day
Default Powdercoating fun

Just started out doing my own powdercoating, figured I'd have to do some on my current project car:





I haven't really messed around or tried anything special to get the powder to work with plastic valve covers yet. I have the eastwood dual voltage kit for the gun, so not really a professional setup that I can really ramp the voltage up, but I had problems getting the powder to stick to the plastic. Tried pre-heat, which helped enough to get the powder on, but ended up that 400f was too much for the plastic covers and they started bubbling slightly anyway. Maybe 350f might have worked, but the powder I have was a wrinkle finish and needs a specific cure temperature/ramp up to work right (even that took some trial and error to get it right). So I ended up with Camaro aluminum covers for this round.

But people here that have had plastic valve covers coated - do you know what temp they were cured at? My next project that I want to do some coating with doesn't have the option to replace the valve covers with aluminum.
Yaj Yak, cmntmxr57 and GTPpower like this.
__________________


1993 SSEi 6MT, huge cam, Twincharged, intercooled, 4-wheel discs brakes, super rust delete, Driveshaftshop.com 800hp custom CV axles, build thread
Kills: '01 GP GTP special edition, '13 Mustang, '10 Power Wagon, 6 Prii, Magnum R/T


Mattstrike is offline   Reply With Quote
Old 08-01-2018, 11:56 AM   #2
 
Mook's Avatar
 
Join Date: May 2007
Location: Elgin
Posts: 158,811
Casino cash: $77837000
36.21 per day
Default

i dig that color
__________________
- TCG Owner & Operator -
We're in the Google Play and iOS App stores!

Mook is online now   Reply With Quote
Old 08-01-2018, 12:21 PM   #3
 
Frank Dukes's Avatar
 
Join Date: May 2009
Location: Rockfordia
Posts: 4,506
Casino cash: $14884700
1.23 per day
Default

Not sure what paint you're using but you should use a different chemistry on plastic. Look for a low cure powder. TGIC poly or similar. Or if you wanna get fancy they make uv cure powder. Source: work at a powder coat manufacturer.
__________________
Frank Dukes is offline   Reply With Quote
Old 08-01-2018, 12:37 PM   #4
Random Crazy Custom Car guy
 
Mattstrike's Avatar
 
Join Date: Feb 2014
Posts: 270
Casino cash: $6490400
0.14 per day
Default

I sourced powder from prismatic powders, I am not aware if they have the option of getting a different formulation of a specific color. I was aware that those low temp powders were out there, just not where or how to get them, and if I can even get a color/texture match to something I'd already had.

I was hoping the valve covers were *close enough* that I could get away with a standard cure temp powder for that reason.
Mattstrike is offline   Reply With Quote
Old 08-01-2018, 01:40 PM   #5
Restoration Hell
 
cap42's Avatar
 
Join Date: Mar 2005
Location: Bolingbrook IL
Posts: 1,922
Casino cash: $3540000
0.37 per day
Default

I did PC out of my garage for a number of years, in order to do plastics and other non magnetic materials you have the part heated to around 200-250 degrees pre heat. Do a large dust coat to get full and even coverage and then cure it at a lower temp for a longer period. The lower temp is defined by the powder as well as the melting point of the part.

So say a valve cover that is plastic will melt at 375 but that is the cure point of your powder (@ 20 mins) you would do your cure temp around 325 for 45 mins.

There was a large internet argument on what what curing at those temps and times did to the integrity of the part. However there was nothing fully conclusive as to it being true or false just a lot of speculation.
Mattstrike likes this.
__________________
1971 Nova - Rust bucket in process of restoration
cap42 is offline   Reply With Quote
Old 08-01-2018, 01:43 PM   #6
Restoration Hell
 
cap42's Avatar
 
Join Date: Mar 2005
Location: Bolingbrook IL
Posts: 1,922
Casino cash: $3540000
0.37 per day
Default

Quote:
Originally Posted by Mattstrike View Post
I sourced powder from prismatic powders, I am not aware if they have the option of getting a different formulation of a specific color. I was aware that those low temp powders were out there, just not where or how to get them, and if I can even get a color/texture match to something I'd already had.

I was hoping the valve covers were *close enough* that I could get away with a standard cure temp powder for that reason.
I'm pretty sure prismatic had low temp cure powders years ago, the low temp powders are ideal for plastics but back a few years ago they didn't have a full range of colors textures available in low temp so people were making due with the regular cure powders.
cap42 is offline   Reply With Quote
Old 08-01-2018, 01:51 PM   #7
 
Frank Dukes's Avatar
 
Join Date: May 2009
Location: Rockfordia
Posts: 4,506
Casino cash: $14884700
1.23 per day
Default

As far as what the chemists here would say, the cure temp is important to reach for full hardness of the paint. Failure to reach full temp can fail impact test. This is mostly a CYA thing for large customers in my experience. Pre heating the part is good. Also there are primers available to help the powder stick to the plastic parts.
Mattstrike likes this.
Frank Dukes is offline   Reply With Quote
Old 08-01-2018, 02:10 PM   #8
Random Crazy Custom Car guy
 
Mattstrike's Avatar
 
Join Date: Feb 2014
Posts: 270
Casino cash: $6490400
0.14 per day
Default

Thanks for the feedback guys! I will look into the primer, don't know why but that skipped my mind.
Mattstrike is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 11:28 AM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0
User Alert System provided by Advanced User Tagging v3.0.6 (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
no new posts