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Post  HalfaDave Wed Jan 11, 2023 12:48 pm

Hi All,
I flew Canadian .25 Scale Combat for 20yrs.
Foam/balsa/ply against amazing coro designs. (very foolish)
The fuel proofing I used worked out well.
I bought a can of semi gloss water based polyurethane varnish. $10.  WPV.
This replaced the epoxy/dope I used to use.
The basic design is a 1/8th ply fuse that holds the engine/guts/wing/tail together. Tail is balsa.
The 'shape' of the fighter I want is sanded white styrofoam.
Wing is hot wired white foam, light glass cloth put on with WPV. (instead of $stinky epoxy)
The plywood nose area gets soaked in Dollar Store CA. (key point)

So, everything is together, ready to paint...
With a nice brush, put a light coat of WPV on everything. Goal is to get to the last piece, as the first piece is ready for the next coat. Another light coat. (like dope, but does not stink)
Divots in foam get filled with light spackle. If you get it right, you can burnish it down to where you do not need sanding.
Next day,
It seems soft, that is good. Fix any parts you don't like.
This is the weird part.
It is not fuel proof.
A coat or two of outdoor latex(acrylic)semi gloss house paint.
More weird, thinned with blue windshield washer fluid. ( I do not know why, I swear !)
If you have brushed on Buterate Dope, you will love this stuff.
You can get any colours you want.
I prefer getting a can of 'Neutral Base'. (dries clear )
And mix and match Dollar Store cheap acrylic paints. 50/50.
The magic is somehow,
The Latex/acrylic sticks like [bleep] to the WPV base. And I have no idea why,
By the time you have done your first light brush coat, you can touch up till you are done. Dries fast.
Thin milky coats, no rollers involved.
Unless you like dumping 1/2 gallon of 15% nitro on it,
Then rubbing it with steel wool.
I do not know, how, why it works.
I am guessing,
The latex, gets in the way,
Between the Castor and Balsa.... Very Happy

Touching up is fun. Semigloss rules.
AND ! You clean any oil off with,
Windshield Washer fluid ! (this freaks me out !)

I love all the old ways,
And all the new ways, to figure them out,

Respect to All,

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Post  944_Jim Wed Jan 11, 2023 5:57 pm

Windshield washer fluid is used as a poor man's "Floetrol." It allows the latex to "flow-out" and "self-level" before it sets. There are other, similar products on the market. Wagner markets one to be used when using their "spitter" spray guns with latex. In this instance, it is used as a thinner/conditioner. I mixed in some windshield washer fluid when I shot the 12'x12' shed in my back yard.

I'm glad to see someone sharing real-world experience with latex. Thanks for bringing this alternative to light!
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Post  HalfaDave Fri Jan 13, 2023 2:32 pm

Hi Jim.
You are right.
Here is another cool thing...
About blue windshield washer fluid (WWF), and Latex/Acrylic paints.
The WWF rises to the top. And preserves it.
I just re mixed a 20 yr old old olive drab from a Mason Jar. Still good.
All the dopes I grew up with,
I had a Hobby shop to get another jar...
I cannot do this now.
I also got allergic to epoxy, that is something I hope you can all, will avoid...
So I send,
This information,
To anyone,

P.S. Washing out brushes with water, is almost fun...

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