stunthanger.com
Building Tips and technical articles. => Paint and finishing => Topic started by: wwwarbird on November 27, 2017, 07:10:11 PM
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Since we can't get the good stuff anymore, Sig Medium Silkspan, I recently picked up some lightweight K&S "OO" silkspan off of Ebay. I believe it's obsolete now too. I only use it for covering solid balsa areas as part of my finishing process.
I think this is the first time I've ever used K&S OO. I'm putting it on wet and then brushing 50/50 Randolph clear through it for attachment. I just finished covering the fuselage pod on the Hutch P-38, it's a piece roughly 16-18 inches long.
After starting at one end with the dope and working to the other I'm getting this gradual buildup of milky residue that ends up being about the consistency of slightly watered down Elmer's white glue. It even builds up to the point of becoming white in color. If I didn't know better I would actually think it could be Elmer's. By the time I reach the far end there's enough of this milky goo that I have to "brush scrape" it off the part as I'm going and then turn and brush the goo out on a piece of scrap cardboard. Then I go back and add more dope, scrape off more goo, repeat, repeat...
When finished and dry it's all seemingly ok, it just generates and spooges out this messy goo as you're doping through it.
I'm just wondering, has anyone else ever had problems with this silkspan goo?
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I dope my span on with a 80/20 mixture to make sure the under coat dope dissolves and flows up into the paper. D>K
Thanks Ty. 80 thinner or 80 dope? I usually use a rough 50/50 combo, being at least 50 thinner.
What the heck is sizing?
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I'm surprised he didn't ask how thick is the dope. I've had cans of Brodak and SIG clear that I had to go with enough thinner that it was like brushing with water.
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That's it Ty, STARCH. That's exactly what this goo acted like, I never knew they did such a thing. Totally makes sense now, this covering must just have more of it than I've run across before. It did come on a roll though, not folded. Thanks for the info!
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Maybe it's toast.