stunthanger.com
Building Tips and technical articles. => Paint and finishing => Topic started by: Bryan Higgins on April 30, 2010, 11:04:20 AM
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Hello Pilots
I Know that alot of guy's and girls use Sig's Lite-Coat dope to finish there planes for a fuel proof upto 15% nitro
but where does Brodaks Crystal Clear Dope stand at ???
Is it fuel proof ?
And how much nitro will it take ?
Thanks Bryan n~
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It stands at about $30.00 a quart and if it is like most Brodak dope it doesn't tolerate much nitro. Some have said not more then 5% nitro. Frankly I prefer Glass Kote.
Dennis
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I guess i'll use polyurethane clearcoat . I wanted to use Brodak Dope products all the way
but i have to use 10 - 15% nitro here in Colorado to get good engine runs.
Are flying field is at 6100ft elevation. D>K
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I use Randolphs (nice because it's about $75 a gallon). Seems fairly fuel resistant up to 10% nitro. But I usually don't use it as topcoat. I go with catalyzed polyurethane. It's very resistant to fuel.
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Was Glass Kote a mis-print of Klass Kote, the epoxy, or a whole 'nother product?
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Hi Larry
I will order some epoxy on my next build i promise. My friend Chris uses it and his stunt planes
look great.
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Was Glass Kote a mis-print of Klass Kote, the epoxy, or a whole 'nother product?
Larry, Yes it was, ny bad.
Dennis
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Hi Randy,
You mentioned that you use Randolph clear, I've been to the Randolph website and they offer several different clear dopes... nitrate, butrate, with tautening and non-tautening versions of each.
Which clear is the one you've been using?
Thanks, Tonyk
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I use Randolph Nitrate, tautening for undercoating balsa surfaces and for applying silk, then switch to non-tautning butyrate for final clear coats. I then use Brodak Crystal clear for final two coats after color.
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That is complicating things to this old man. I use butyrate from the first coat. After reading an article that Windy U. wrote, I thin the dope considerably. Then I slightly remember Robert S. saying something about doing two coats of base clear before sanding. So far have not had dope lifting at the fuselage to flying surfaces. H^^
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My bad, I meant tautening butyrate for the final clear coats before color. I found out that the butyrate colors from Randolph are all non-tautening. John, didn't mean to confuse anyone, the Randolph stuff is cheaper than the LHS dope, so thats the reason I've been using it. Been back at this less than 2 years and have learned so much fron this forum and others. See, an old dog can learn new tricks! Even learned how to use a spray gun.
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For Randolph Clear you want A-1690. That is their untinted, non-tautening butyrate. It does not have the slight yellow tint that standard Brodak Clear has. I bought a gallon a few months ago at Spencer Aircraft in Washington and paid $43 for a gallon. A lot better than $30 a quart for Brodak Clear Coat. Most Randolph colors run about $22 to $25 per quart which is the smallest size you can get.