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Oct 26, 2020, 10:49 PM
David Vels
Larrikin's Avatar
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Quote:
Originally Posted by MTT
Silly (maybe) question :

Why use Stix-it at all ?

I have covered several airframes with Koverall, always gave the wood one coat of undiluted dope, sanded it, and then " glued" the fabric to the airframe with diluted dope. The diluted dope will "activate" the dope already in the wood, and this way make a solid bond.
I have never had any issues with fabric coming loose.
Hi MTT,
Thanks for sharing your experience.
I recall my dad covering models the same way. My confusion is that there are the two types of dope, knowing which is which and how to use them.
What is used to dilute dope? Lacquer thinners, acetone, Isopropyl Alcohol?
I bought a can of "Aircraft Dope" from my local hobby shop (LHS), but it isn't labeled one or the other so I'm still none the wiser.

This quest has lead me to do some trials with solvent based products from the LHS and water based products from a hardware store.
These trials include an adhesion test and a shrink test with the various, aforementioned products.
I plan on posting these results when I'm happy that the results are reliable.

If it sounds like I'm over complicating this, you're probably right.
My quest is driven by both a shortage of a known and proven product, and the want for a cost effective, non-solvent based alternative.
That said, I'd use dope and a diluting agent if I knew what I was buying and if they were locally available. (unlikely)

D.
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Oct 26, 2020, 11:32 PM
Registered User
perttime's Avatar
The thing with "dope" has worried me, too.
On US based forums people will tell me to use XXX. Nothing that is available somewhat locally says it is XXX. Somebody on a local forum might suggest that ÖÖÖ used to be about the same - but it was last available in 1987 and people are using their stash frugally. ÄÄÄ will work, too, except it has some drawbacks....
Oct 27, 2020, 04:09 AM
David Vels
Larrikin's Avatar
Thread OP
Quote:
Originally Posted by Larrikin
What is used to dilute dope? Lacquer thinners, acetone, Isopropyl Alcohol?
It appears that I’ve been able to answer my own question.
From THIS site, the author writes,
“ The proper name for dope is Nitrocellulose Lacquer. It has been around since the 1920 in industrial and commercial form. It is best dissolved with lacquer thinner.”

Now, which dope is which, how to use each and where does one get them?
Oct 27, 2020, 04:44 AM
David Vels
Larrikin's Avatar
Thread OP

Correct me if I’m wrong ...


Who can tell me what balsa cement is made of ... other than “acetate”?
I have a suspicion that C-23 balsa cement and Stix-it are one and the same.
I’m happy to be proven otherwise.
Last edited by Larrikin; Oct 27, 2020 at 05:09 AM.
Oct 27, 2020, 04:57 AM
David Vels
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Double post
Oct 27, 2020, 06:20 AM
Registered User
perttime's Avatar
In many places, I suspect "nitro dope" might be found in arts and crafts stores - and places that have supplies for building musical instruments. "Nitro" is supposed to give a lighter coating than modern substances, which is better for "tone". It also gives a vintage look that wears faster. So it is especially favored by people who want to "relic" their guitars.
Oct 27, 2020, 07:33 AM
MTT
MTT
I care about rising air !
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It is my understanding that there are 2 types of dope, nitrate and butyrate.
Butyrate is fuel-proof, nitrate is not, which doesn't matter in the case of sailplanes.
Also nitrate dope is only available as clear dope, wheras butyrate can be in colors.

==>https://brodak.com/nitrate_and_butyrate

And yes, you can use lacquer thinner to dilute dope.
Oct 27, 2020, 07:38 AM
MTT
MTT
I care about rising air !
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Forgot to include this :

Source for both nitrate and butyrate dope : https://sigmfg.com/
Oct 27, 2020, 09:00 AM
Registered User
perttime's Avatar
For some things, Sig and Brodak might not be easy sources for Australia - or northern Europe, for that matter.
Oct 27, 2020, 09:30 AM
MTT
MTT
I care about rising air !
MTT's Avatar
Sorry, I hadn't noticed that the OP is in Australia...


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