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darinh
Joined: 20 Apr 2006
Posts: 327
Location: Utah
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 Posted: Tue Dec 04, 2007 10:22 am Post subject: Aerothane vs. Ranthane? |
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Does anyone have experience with these two topcoats? I am using one or the other so I am not looking for opinions that I should not use it because it will kill me (I do have the proper breathing and spraying equipment) or that I should use polytone or AFS, but rather opinions from people who have sprayed both or have seen both sprayed. As many know, Randolph (maker of Ranthane) was purchased by Polyfiber in 2004 and so now Ranthane is a Polyfiber product. Just as a side note, Ranthane is a mil-spec product...not that that really matters, just interesting.
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Darin Hawkes
Series 7
914 Turbo
Kaysville, Utah |
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lcfitt(at)sbcglobal.net
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| Posted: Tue Dec 04, 2007 1:22 pm Post subject: Aerothane vs. Ranthane? |
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Darin,
I don't know if this is what you are looking for as I am not entirely sure
of the exact products used, but a couple of guys rebuilt a Stearman several
years ago using a Randolph finish obtained through Polyfiber. I am not
sure what was in the base coats, but the Randolph topcoat would blister up
during flight on the tops of the wings as it had not adhered to the bottom
coats. Since all components were approved by Polyfiber, they felt obligated
to correct that problem and the factory recovered both wings at their
expense and the final job was done in Aerothane over Polybrush and
Polyspray. My guess is that with those types of experiences, Polyfiber
wouldn't recommend mixing brands if there was a problem. I think I would
check with them before committing to Ranthane.
Lowell
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darinh
Joined: 20 Apr 2006
Posts: 327
Location: Utah
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| Posted: Tue Dec 04, 2007 2:12 pm Post subject: Re: Aerothane vs. Ranthane? |
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Lowell,
Thanks for the reply. That is interesting because I did speak with Greg from Polyfiber this morning and his recommendation was that if he were starting from a clean slate (new cover and install) he would use Ranthane for the color coat. He said that Aerothan and Ranthane polyurethane top coats are very similar in chemical makeup but the catalyst ratio is slightly different (3:1 on Aerothane and 2:1 on Ranthane). So you get more sprayable material out of a gallon of ranthane than you do Aerothane. He said the biggest difference is that Ranthane is more forgiving in the application and requires only 2 coats. The instructions also say that you spray a medium tack coat, let it flash 10 minutes and follow it with a wet coat for cover and color and your done. With Aerothane as you know, it requires many light mist coats and you have to be extremely careful or you will get runs in the paint. I think I am going to go with the Ranthane on Polyfiber's recommendation but wanted to see if someone has experience spraying both.
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Darin Hawkes
Series 7
914 Turbo
Kaysville, Utah |
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Bob
Joined: 24 Oct 2006
Posts: 89
Location: Damascus, Maryland, USA
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| Posted: Wed Dec 05, 2007 6:34 am Post subject: Re: Aerothane vs. Ranthane? |
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As emotionally attached builders and owners, we seem to regularly get into these chocolate/vanilla/strawberry ice-cream debates.
I'd strongly recommend that you call some of the commercial users. The real expertise is with the aerial applicators (crop dusters), back-country operators, and pipeline patrol guys.
Bob
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