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Building Tips and technical articles. => Paint and finishing => Topic started by: Air Ministry . on June 11, 2018, 01:48:08 AM
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(https://images.duckduckgo.com/iu/?u=https%3A%2F%2Ftse3.mm.bing.net%2Fth%3Fid%3DOIP.CXN9xpoM7qD5N1eNU5EicgHaH_%26pid%3D15.1&f=1)
Is this stuff the end of the world , or is it actually posable to get a top level lasting finish with such stuff ?
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I don't use dope anymore. D>K
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Is this stuff the end of the world , or is it actually posable to get a top level lasting finish with such stuff ?
What are you talking about? I haven't seen this dope before, but what about it do you think is different? All dope contains a huge fraction of acetone and xylene, and all of it is arguably poisonous/toxic. I am sure the volatile components are listed because some places legally required you to state the VOC content (volatile organic compounds).
Brett
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Right Then .
Used to be $ 30 for 4 gallons , from supplier Brolite New Zealand . Aircraft Dope . back in the early 70s . Had to thin it 50 % or the brush would stand up in it . For Starters .
As we built mainly Combat Wings , youd throw 5 coats on in quick succcesion . With the zylene labled NZ stuff now , some cracking up with hurried application , you dont get with Sig Dope !
The stuff pictured is $ 30 a litre ( about a US Quart ) in Austrawlia now , $ 11 to $ 16 turn of the century . :(
Stuff shown gives a bit of a gloss . Labled as ' Nitro Cellulose Lacker ( fine print ) model engines brand here back then ( 2000) gave superior finish with less coats .
Thanks for putting us straight on that Brett . Theres a ' pheonics Lacquers ' Dope Here . Nitrate 7 Butrate shrinking & non shrinking . Theyre scared of the shrinking in places .
They also do a Nitro Cellulose Lacquer , which is Nothing Like the 70's Nitro Cellulose . >:(
But , From the Horses Mouth , same as Nitrate with' more body ' . Blankety Nitrate drps to show the grain, a week after you think youve finished . >:(
SO , I think its two coats of shrinking , for the Open Bays , and Their Nitro Cellulose for base . Then AUTO CLEAR . The #@&^* Two Pot put 6 Oz on the P 51 , so thats out . >:(
The Dupli Colour CLEAR seems V fuel resistant , given a chance to harden /
Problem Is theres no Brodak , The Mnfg ( new Owners ) has messed with the Pheonics Formular ( no doubt to lower costs . ) PLUS its Not CLEAR Finish . light brown yellow tint . :(
Sig is $ 45 + a Quart ( NO Gallon cans ) and no Lite Coat , Unless theyve reponded to my harangueings , said theyd check it out , importer .
Summary !
Previous ' xylene ' labled was 10 coats no gloss , or shrink cracking . No Real Nitro Cellulose No More .
When it were $ 30 four gals/ 7.50 GALLON , $ 80 Gal for Pheonics or $ 250 Aus. odd per Imperial Gallon for Sig Here , you can see a worried man singing a worried song . :P
NOW , if it were 1968 AGAIN , We Wouldnt Have These Problems ! >:( and did I mention The Balsa Wood . >:D :'(
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Previous ' xylene ' labled was 10 coats no gloss , or shrink cracking . No Real Nitro Cellulose No More .
When it were $ 30 four gals/ 7.50 GALLON , $ 80 Gal for Pheonics or $ 250 Aus. odd per Imperial Gallon for Sig Here , you can see a worried man singing a worried song . :P
NOW , if it were 1968 AGAIN , We Wouldnt Have These Problems ! >:( and did I mention The Balsa Wood . >:D :'(
That's almost certainly the effect of the solids in the dope, not the xylene (which is in all dope, shiny or otherwise, as far as I know). 10 minutes after you apply it, the xylene is long gone.
The problem you describe, however, is very similar to what we used to get with the later versions of Aero-Gloss "dope" here. The cracking and apparent incompatibility are hallmarks. The issue is that at least later versions of Aero Gloss were not nitrocellulose or butyrate dope, but acrylic lacquer, which some people used successfully, but was very prone to cracking, in at least some batches.
Brett
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For awhile, I used DuPont Acrylic Lacquer. Great stuff, very easy to work with and gave a brilliant finish, but was not even a little fuel proof and was wildly incompatible with anything but itself.
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For awhile, I used DuPont Acrylic Lacquer. Great stuff, very easy to work with and gave a brilliant finish, but was not even a little fuel proof and was wildly incompatible with anything but itself.
“Awhile “ for Randy could mean one coat. He was famous for never using consecutive coats of the same paint.
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“Awhile “ for Randy could mean one coat. He was famous for never using consecutive coats of the same paint.
You can put butyrate dope over acrylic lacquer but you have to be careful to not flood coat the clear or it will float the lacquer underneath. I did this back when you could still buy acrylic lacquer in Cali.