Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 10-13-2017, 09:38 AM   #11 (permalink)
EcoModding Apprentice
Bicycle Bob's Avatar
Join Date: May 2008
Location: N. Saskatchewan, CA
Posts: 1,357

Appliance White - '93 Geo Metro 4-Dr. Auto
Last 3: 42.35 mpg (US)

Stealth RV - '91 Chevy Sprint Base
Thanks: 51
Thanked 216 Times in 155 Posts
Coroplast is polypropylene, one of the waxy plastics, but it is used extensively for signage, so the factory gives it a "Corona Discharge" treatment to enhance adhesion. When you break open a fresh bale of the stuff, you get sparks like taking off a wool sweater in a dry room. I have seen a piece of it that lay on the ground for months still attract paint from the end of a pointed artists' brush from a short distance, producing an effect like a weak airbrush. However, I'm also having major flaking problems on a re-painted piece. So, it might be back to the sign shop for some vinyl wrap, which can be printed to any hue.

  Reply With Quote
The Following User Says Thank You to Bicycle Bob For This Useful Post:
Grant-53 (10-13-2017)
Alt Today
Popular topics

Other popular topics in this forum...

Old 10-13-2017, 03:37 PM   #12 (permalink)
Master EcoModder
Join Date: Feb 2010
Location: Elmira, NY
Posts: 1,511
Thanks: 226
Thanked 247 Times in 209 Posts
Check the Coroplast website for their recommendations. Also check with the local auto body paint suppliers. If you want, switch to ABS plastic which is used on auto fascia. Light sanding, 400 or 600, clean and tack rag, light primer coat, use automotive basecoat / clearcoat acrylic enamel or an industrial grade enamel. White rubberized undercoat can be painted over for abrasion resistance. Use a respirator and down draft paint booth. A large box and a shop vacuum vented outside will do. A heat lamp might be handy as the ambient temperature drops below 70 F.
  Reply With Quote
Old 10-14-2017, 10:52 AM   #13 (permalink)
Recreation Engineer
KamperBob's Avatar
Join Date: Dec 2009
Location: Somewhere USA
Posts: 520

Black Stallion - '02 Toyota Tundra 4WD xCab

Half Pint - '06 Yamaha XT225
Thanks: 303
Thanked 136 Times in 101 Posts
I don't have any first hand experience to share. But, once upon at time I read somewhere, possibly (probably?) on this forum, about folks gluing pieces of coroplast together. The tip was flashing the surface with a flame torch to break down some kind of coating. Just enough for that, not warping the coro, so scrap practice seems prudent. Maybe it's a UV protective coating? Then it was gluable. I'm thinking chemical adhesion here. Mechanical adhesion by sanding only maybe at play with some paint flaking anecdotes.

Another thought: election signs. Find some place that does that kind of printing. Maybe they'll share a nugget or two of experience about making coroplast hold colors.

Recreation Engineer
  Reply With Quote
Reply  Post New Thread

Thread Tools

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com