Oratex is like Yoga Pants

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Re: Oratex is like Yoga Pants

Postby BDA » Thu May 10, 2018 2:00 pm

Your welcome Bruce
I hope someone can learn from my mistakes.
SuperStol XL With Titan 340
#486 - Started 9-2016
Mods in progress: Wing extensions, Airfoil tail ribs
Goal: 15mph no wind
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Re: Oratex is like Yoga Pants

Postby BDA » Thu May 10, 2018 11:43 pm

More aileron covering pics

Iron at 130 - it says celcius but temp gun says 130 f, not sure wich one to believe.

I was teying to lay it down flat so no wrinkles to fix later, buuuut was not that lucky.
Left a wrinkle line at the rivets that I shrunk down with heat gun.
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SuperStol XL With Titan 340
#486 - Started 9-2016
Mods in progress: Wing extensions, Airfoil tail ribs
Goal: 15mph no wind
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Re: Oratex is like Yoga Pants

Postby BDA » Fri May 11, 2018 2:51 am

Here is a pic of the aileron with 2 coats of the glue before I stirred it up. Totally transparrent, very thin.

You can kind of see the glue around the rivets

You can also see the “alodine” conversion color on the metal.
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19589F65-4A2D-4305-8BB7-696C165BA79C.png
SuperStol XL With Titan 340
#486 - Started 9-2016
Mods in progress: Wing extensions, Airfoil tail ribs
Goal: 15mph no wind
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Re: Oratex is like Yoga Pants

Postby BDA » Fri May 11, 2018 3:34 am

Flaps getting a good scrubbin before acid “conversion” and covering.

Conversion is a must so that corrosion does not delaminate the glue.
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373464D2-083C-42B3-AF74-5DF5F5748CF6.jpeg
SuperStol XL With Titan 340
#486 - Started 9-2016
Mods in progress: Wing extensions, Airfoil tail ribs
Goal: 15mph no wind
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Re: Oratex is like Yoga Pants

Postby SheepdogRD » Sun May 20, 2018 2:18 pm

Note for anyone using silver Oratex: for small parts touch up -- hinges and the like -- try Rust-Oleum Painters Touch 2X Ultra Cover Metallic Aluminum paint. It's an amazingly good color match for the silver Oratex fabric, both in and out of the sunlight. Like the Oratex, it has a satin finish. It's probably not useful for large areas, as it's hard to get a rattle can to cover evenly. But for small parts, it's great.

Rust-Oleum Painters Touch 2X Ultra Cover Metallic Aluminum 249128.jpeg

It's available at hardware stores and Walmart, SKU 249128.

Here's a sample. The outer part is a an area of overspray on masking tape where I pulled it off a painted part and stuck it on an aileron. The hole in the middle shows (unpainted) Oratex.
20180520_140129 s.jpg


This NOT the same as "Rust-Oleum Universal Metallic Paint & Primer In One, Titanium Silver". I used the Titanium Silver originally, and it's close to the Oratex, but it's just too shiny and metallic. Now I'm repainting the parts in the Ultra Cover, and I'm getting what I wanted in the first place.
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Highlander N7340Z -- Ms. Tonka -- in gestation

If just enough is really good, then too much ought to be perfect.
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Re: Oratex is like Yoga Pants

Postby AV8R Paul » Wed May 30, 2018 4:04 pm

Thanks for the tip on the Paint, I believe Chris is using it on my plane.
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SuperSTOL XL - N357TX - Titan 180 HP
S/N JA498-11-16
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Re: Oratex is like Yoga Pants

Postby AV8R Paul » Fri Jun 01, 2018 4:15 pm

Chris sent me s photo of the access panels, with a comment that the Silver Rust-Oleam paint is a very close match.
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AV8R Paul
SuperSTOL XL - N357TX - Titan 180 HP
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Re: Oratex is like Yoga Pants

Postby BDA » Tue Jun 05, 2018 3:47 pm

Thankyou for the tips om the paint!!

Lars cam to see my project and I asked him about my problem areas.
Sounds like the reason that the fabric wont shrink any more around the vertical transition is because I got the fabric temp too hot.

I had the gun set to the right temp, and it was working good, but had alot to shink in that area so I stayed in that spot for long enough for the fabric to heat up beyond its shrink temp, at which point it becomes “set”. It did not discolor, and is still structurally sound, just wont shrink any more right there.
So, where you have big wrinkles -
DONT SHRINK THEM ALL AT ONE TIME!

Shrink some then go somewhere else and let it cool.

We also did a test on my test panel that I had painted with Stewarts metalic blue. Severe stretxh/ dent then reshrink with heat, no change in the paint!!
Very pleased with the Stewarts paint, although the metalic is hard to get on evenly.

Lars also brought me some of the Oratex bondo to fix the wrinkles in finish tapes, will post results next week or so.
SuperStol XL With Titan 340
#486 - Started 9-2016
Mods in progress: Wing extensions, Airfoil tail ribs
Goal: 15mph no wind
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Re: Oratex is like Yoga Pants

Postby TD1 » Wed Jun 06, 2018 2:55 pm

Thanks for the updates, just in case you think nobody is following.... I'm one of what I'm sure is many who check these builds everyday, learning a lot.

Oratex bondo? Interesting, I don't think I've seen that on their web page. Is it color as well or will you have to paint over it?

Tom
Tom Dougherty
Kahului, HI
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Re: Oratex is like Yoga Pants

Postby BDA » Thu Jun 07, 2018 12:13 pm

The “bondo” is a two part filler that stays flexible, to be painted over or taped over.

My buddy has used it and really likes it. I will post pictures when I try it out.
SuperStol XL With Titan 340
#486 - Started 9-2016
Mods in progress: Wing extensions, Airfoil tail ribs
Goal: 15mph no wind
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Re: Oratex is like Yoga Pants

Postby BDA » Fri Jul 13, 2018 4:21 am

Finally got around to cvering flaps and putting tapes on ailerons too.
I am getting better at it, less wrinkles and deformation to fix.

The tape is a whole different animal.
it is made from oratex 600 so it is thinner and shrinks and deforms easier.
It is very easy to go too fast with heat and felt and get wrinkles that wont come out.
Dont do the tapes untill you have plenty of extra time, dont get in a hurry.

With the thinner tape you can shrink any deformation away - if you dont get it too hot too fast.
If you can see it shrinking its too hot.

Tried all methods of shrinking around rivets again, pointy hobby iron works the best, by far - but you have to be careful.
Put tapes on with cooler temp to avoid deformation then go back over with the final temp to set glue.
Use the iron to tack the tapes down as the heat gun likes to shrivel the edge if not against something else.
SuperStol XL With Titan 340
#486 - Started 9-2016
Mods in progress: Wing extensions, Airfoil tail ribs
Goal: 15mph no wind
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Re: Oratex is like Yoga Pants

Postby BDA » Fri Jul 13, 2018 12:29 pm

When covering the smaller pieces it is easy to get a really good looking first side by heating and stretching the fabric tight and pulling it over any lumps or curves ( rivets etc.) on the trailing edge but then you get to the other side and your fabric is very deformed and you have preformed wrinkles to deal with. Better to pull tight without heat when wrapping around edge. Then you have a straight and flat piece of fabric to start with on that side.

BEFORE covering flaps and ailerons, run a drill through the holes that the fabric rivets go in. Not only are they not punched the right size, but the glue also dries in them when applying for fabric. Drilling through fabic and reinforcement tape sucks.

I used vise grips and a rivet stem to poke the rivet holes through fabric. Little cheap battery powered solder iron works good for sealing fabric holes for rivets, and cleaning the hole up. Do fabric holes first then reinforce tape then holes again. The yoga pants effect will magnify gap between rivet and reinforcement tape, run the tape right up to it.
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0E1C7270-C3AF-4468-9567-D25280AD2BDC.jpeg
D119DA78-91A1-414F-B7D7-925A35FD596A.jpeg
SuperStol XL With Titan 340
#486 - Started 9-2016
Mods in progress: Wing extensions, Airfoil tail ribs
Goal: 15mph no wind
User avatar
BDA
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Posts: 137
Joined: Mon Aug 22, 2016 11:25 am
Location: Kenai Alaska

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