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Using colored Dope (Read 229 times)
Reply #4 - Aug 13th, 2019 at 8:02am

New Builder   Offline
Senior Member
Amherstburg, Ontario, Canada

Posts: 1051
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Tom - I started this search mostly because I could not find a red tissue that had any substance at all and since I use domestic tissue only (ordering any tissue and paying cross border costs is way too much) the Hallmark white has the most density of all their products. So, flying in the face of the axiom of painting red on red, etc., I went with the white and set out to develop the color I wanted. Since I use Eze dope and it's water soluble, I reasoned I could color it with most any water based color I wanted so I chose watercolor since it is nearly transparent thinking it would give me color without clouding the translucency. It took two tubes of watercolor since I mixed up a lifetime supply of Eze dope in the standard 30/70 dilution. I started with red tissue and the results were less than good so went to the white and started with tissue stretched on my test frames and the color was way off being too much red. To get that Bing Cherry color shown in the photo it definitely needed blue so added what I thought would be enough, mixed it in and sprayed it on. The density added up very quickly and needed to be thinned considerably and the pressure increased on the airbrush. I tried brushing the mix and as I mentioned, it broke into streaks and was rather ugly. I went back to spraying and the result is very thin dope (seems to be thinner than the usual 30/70 mix) and 20 PSI at the airbrush.
Mike
 

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Watercolor_tubes.jpg

Have no fear of perfection - you'll never reach it. (Salvador Dali 1904 - 1989)
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Reply #3 - Aug 12th, 2019 at 1:18pm

Sky9pilot   Offline
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Stick & Tissue
Kelso, WA 98626 USA

Posts: 10913
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I'm very interested in your process here with the EzeDope.  How are you arriving at the color and what is the acrylic paint you're using to get the color.  Is it artist acrylic in a tube?  This is very interesting. I'm following your progress!
Tom
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #2 - Aug 12th, 2019 at 8:43am

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Senior Member
Amherstburg, Ontario, Canada

Posts: 1051
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After several tests (this is not the Fang wing but a test wing I had laying around) with the color the actual application of the colored dope went very well. Found this cannot be brushed on since something in the watercolor addition causes the color to break into streaks and dries very ugly. This is the final color and application trial and airbrushing this on works very well. It goes on smoothly and dries much faster than the traditional Eze Dope by itself. Application took about five passes to get the density I wanted while still keeping some translucency. This is going to be my solution for tissue I cannot find in whatever color I need.
Mike
 

Have no fear of perfection - you'll never reach it. (Salvador Dali 1904 - 1989)
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Reply #1 - Aug 8th, 2019 at 10:36am

New Builder   Offline
Senior Member
Amherstburg, Ontario, Canada

Posts: 1051
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Went a bit further with the color for the Fang and sprayed the colored dope over white tissue until I got a fairly good density. I have never sprayed Eze dope but will from  now on. It went on exceptionally smooth and dried very quickly. The frame showing through the tissue is the vertical stab for the fang. It was laying on a jar lid and I laid the tissue and frame over it to see if there was any translucency and was nicely surprised. The color is not quite right and needs a little blue added to bring the color to the bing cherry color of the photos. Question now is, cover with white tissue and spray or cover with dyed tissue, shrinkage is the same either way. More soon.
Mike
 

Have no fear of perfection - you'll never reach it. (Salvador Dali 1904 - 1989)
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Jul 31st, 2019 at 8:56am

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Amherstburg, Ontario, Canada

Posts: 1051
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I have been working on how to cover my Fang project to show as much continuity as possible between the balsa surfaces around the cowl and the open framework elsewhere. I started with Hallmark red tissue only to find it was nearly void of any color fibers but pushed on anyway. I reasoned that since I use water base dope I could color it with a water based material and settled on watercolor. After mixing the usual dilution (30/70) I added two tubes of Alizarin Crimson and stirred in using my powered tool. The second pic shows the results of that and definitely not acceptable but is progress, however the lack of density in the tissue is a non-starter and is showing signs of streaking. I have stretched plain white tissue on a frame and will pick up the test there and will spray the mixture if it continues to streak.
Mike
 

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Tissue_2_001.jpg

Have no fear of perfection - you'll never reach it. (Salvador Dali 1904 - 1989)
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