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General control line discussion => Open Forum => Topic started by: Dan McEntee on April 13, 2019, 07:09:19 PM

Title: Chemical Compatibility
Post by: Dan McEntee on April 13, 2019, 07:09:19 PM

    This has been in the forefront pretty regularly with the popularity of rattle can paint jobs. I was going through some magazines today that came from the estate of a club member that passed away several years ago, Virgil Diekmann. Some of you may remember him. In one of the Model Aviation magazines from August, 1993, in Bill Boss' scale column, there was mention of a book on building model airplanes (FYI-Model Flight) and inside was a small chart on chemical compatibility, in other words, what can go over or under what! The column is on page 78 and those that are still AMA members can view it on the website. Maybe one of the computer wizards can copy it and pin it to the top of the painting and finishing section? It might save a lot of grief for new comers. Bill Boss was one of THE top control line scale builders and wrote that column for a long time as was one that I always and least glanced at, so you know the info should be correct.
   Type at you later,
     Dan McEntee

Title: Re: Chemical Compatibility
Post by: Mike Griffin on April 13, 2019, 09:27:17 PM

Thank you for posting this Dan.  It could possibly eliminate a lot of headaches.

Mike

Title: Re: Chemical Compatibility
Post by: Joe Bowman on April 13, 2019, 10:14:40 PM

I posted this in the paint and finish section but will post here also.

Title: Re: Chemical Compatibility
Post by: George Truett on April 14, 2019, 08:44:10 AM

Epoxy Enamel is any of the epoxy paint we normally use, Klass Kote, SuperPoxy, etc..

Title: Re: Chemical Compatibility
Post by: Dave_Trible on April 14, 2019, 08:47:40 AM

Quote from: Motorman on April 14, 2019, 07:30:52 AM

Cool chart, looks like you can paint anything over nitrate dope. What is epoxy enamel?


Thanks,
Motorman 8)

Appliance touch up paint in a rattle can is called appliance epoxy.  It’s just a very hard enamel- and enamel is usually about the hardest paint to begin with.

Dave

Title: Re: Chemical Compatibility
Post by: Dave Harmon on April 15, 2019, 09:24:52 AM

Anyone know if automotive clearcoat can be applied over butyrate color dope and/or nitrate clear dope??

Title: Re: Chemical Compatibility
Post by: Howard Rush on April 15, 2019, 01:02:03 PM

Quote from: Dave Harmon on April 15, 2019, 09:24:52 AM

Anyone know if automotive clearcoat can be applied over butyrate color dope and/or nitrate clear dope??

Catalyzed polyurethane automotive clearcoat (isocyanate death paint) goes over butyrate dope or acrylic lacquer just fine.  I have had instances of acrylic lacquer, particularly dark colors, bubbling up under IDP when the plane gets warm in the sun.  I presume solvents get trapped under the clearcoat.  I would reckon this could happen with dope, too, if one doesn't wait long enough for it to dry.