News:
2019----><---- T Shirt




  • May 24, 2019, 02:05:45 AM

Login with username, password and session length

Author Topic: Primer over Epoxy  (Read 500 times)

Offline Motorman

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 4555
  • Millville NJ PDQ Flying Clown Country
Primer over Epoxy
« on: March 10, 2019, 11:10:19 PM »
I'm building a profile plane for a glow engine that has the stab/elev and nose covered with fiberglass and Zpoxy. Also have some strips of black CF on the fuselage. Other areas are bare balsa. I'm thinking dope won't stick to the glass surfaces but is there a primer that will stick and allow me to use white Sig Dope? Any other suggestions?


Thanks,
Motorman 
There will be a sunny day and we will fly our airplanes.


Offline Randy Powell

  • Moderator
  • Trade Count: (0)
  • Admiral
  • *****
  • Posts: 10009
  • TreeTop Flyer
Re: Primer over Epoxy
« Reply #1 on: March 11, 2019, 03:10:34 PM »
Super Fill makes a catalyzed high build auto primer that will stick to anything. Most catalyzed primers will. It would allow you to use lacquer over it. Be a pain to repair, but it would work fine.
Member in good standing of P.I.S.T
(Politically Incorrect Stunt Team)
AMA 67711

Randy Powell

Offline Serge_Krauss

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1169
Re: Primer over Epoxy
« Reply #2 on: March 11, 2019, 03:35:48 PM »
I've doped over fiberglass/epoxy on two planes. It seemed to work well over sanded surfaces and has not lifted or otherwise come loose from my profile fuselages. BUT on the last stabilizer, my clear Brodak butyrate did bubble up in places after a few days at the field. I think it will stick, if I clean it up some and re-do it. Maybe it's vibration in that part, because the two fuselages are just fine after a couple years.

Offline Skip Chernoff

  • 2019 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 1149
Re: Primer over Epoxy
« Reply #3 on: March 11, 2019, 07:39:25 PM »
Rustoleum Automotive Primer works for me.

Offline Motorman

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 4555
  • Millville NJ PDQ Flying Clown Country
Re: Primer over Epoxy
« Reply #4 on: March 11, 2019, 10:03:35 PM »
Skip, I see three kinds of Rust-Oleum automotive primer, which one do you use?

Self Etching Primer

Sandable Primer

Filler Primer 

Thanks,
Motorman
There will be a sunny day and we will fly our airplanes.

Offline Paul Wood

  • 2016 supporter
  • Trade Count: (0)
  • Commander
  • *
  • Posts: 286
Re: Primer over Epoxy
« Reply #5 on: March 12, 2019, 03:57:06 PM »
Skip, I see three kinds of Rust-Oleum automotive primer, which one do you use?

Self Etching Primer

Sandable Primer

Filler Primer 

Thanks,
Motorman

I'm not trying to answer for Skip, just letting you know what works for me. I use DupliColor primer and they offer the same options as Rustoleum. I use the filler primer because it has more pigment to fill the grain. The sandable primer is basically just a color blocker with little or no build up. The etching primer is to ensure a better bond to the under coat. Again, little build up. These are meant to work on metal surfaces to achieve various outcomes. But for us, I find the filler works best.

Paul   

Offline Motorman

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 4555
  • Millville NJ PDQ Flying Clown Country
Re: Primer over Epoxy
« Reply #6 on: March 13, 2019, 10:08:04 AM »
I'm more worried about the bond since it's just a practice plane but, thanks for the info. Maybe etching primer then filler primer? How long before you can paint dope over rustolium primer, weather's warming up.


Thanks,
Motorman 8)
There will be a sunny day and we will fly our airplanes.

Offline bill bischoff

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1302
Re: Primer over Epoxy
« Reply #7 on: March 19, 2019, 02:35:17 PM »
The Napa Colorline DC540 primer that everyone knows and loves works fine over epoxy finishing resin and epoxy primer(Klasskote or K&B). On the bare wood, brush on a coat or two of finishing resin cut with denatured alcohol to seal the wood before priming.


Tags: