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donaho1(at)verizon.net
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 Posted: Thu Dec 20, 2012 5:28 am Post subject: Retrofitting inspection rings |
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When I built my FSII, the plans didn`t call for inspection rings. Can they be retrofitted on fabric that has already been shrunk and painted? I still have fabric and paint. So all I would need is Poly-brush and the rings, correct? N598LF
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Ducati SS
Joined: 15 Oct 2009
Posts: 93
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| Posted: Thu Dec 20, 2012 5:49 am Post subject: Re: Retrofitting inspection rings |
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I spoke to a local pilot last week that has the same problem with his restored super cub. He was telling me about a product ( glue) that can be applied to the ring, the ring can then be positioned, removed and repositioned if needed right over the existing paint. I believe he said that heat activates the glue and the ring is permanently adhered. I will monitor the list and if no one has the name of the product I will contact him and get it for you.
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donaho1(at)verizon.net
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| Posted: Thu Dec 20, 2012 5:59 am Post subject: Retrofitting inspection rings |
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Thanks Ducati, I would appreciate that information.
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Thu Dec 20, 2012 7:06 am Post subject: Retrofitting inspection rings |
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On Behalf Of Lanny Fetterman
When I built my FSII, the plans didn`t call for inspection rings. Can they
be retrofitted on fabric that has already been shrunk and painted? I still
have fabric and paint. So all I would need is Poly-brush and the rings,
correct? N598LF
Lanny/Kolbers:
Retrofit inspection rings like you would apply a patch to the fabric.
1-Prep the area (clean and scuff).
2-Polytak the inspection ring to the fabric.
3-Cut out a round patch about the size of a No. 10/gallon coffee can.
4-Polybrush the patch over inspection ring.
5-Polyspray, if you want to, and paint.
You don't have to cut out the hole in the inspection ring until you need to
gain access for inspection.
I would not try to glue the inspection ring to the fabric. It probably will
not get the job done.
john h
mkIII
Titus, Alabama
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John Hauck
MKIII/912ULS
hauck's holler
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Thu Dec 20, 2012 7:11 am Post subject: Retrofitting inspection rings |
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Lanny, It depends upon the result you want. For results that will make it look like you put them there when you did your original cover you'll want to use MEK and remove all the coats down to bare fabric in the area where you want to put the inspection rings and install them per the manual. Treat them as you would a patch and install them with a 50/50 mix of MEK thinned Poly Tack, not Poly Brush. The next best method is to install over the current coatings, again using a thinned Poly Tack. Once you have the rings on and the cover fabric glued down use a Tape Down sheet, a product my company sells that allows you to use a sealing iron to melt the coatings and drive the edge of the fabric down into the existing Poly Tone for a perfect seamless installation.
Tape Down is a high temperature fabric that allows the heat of the iron to pass through it without allowing the heat softened coatings to stick to the iron. Guaranteed to work or your money back. $12 for a 6 inch square sheet that lasts a life time. I sealed over 200 feet of tape edge on Ken Holle's Mk IIIX with a single sheet of Tape Down and it's still like new. It saves all the work, money and mess of removing coatings and pays for itself the first time you use it.
The least perfect method is to just glue new fabric on and coat with Poly Brush, Poly Spray and Poly Tone to match the color with the original coatings. The fabric edges will stick up and it will look like what it is a scabbed on patch. It will be functional but ugly.
Contact me off list to buy Tape Down.
Rick Girard
On Thu, Dec 20, 2012 at 7:28 AM, Lanny Fetterman <donaho1(at)verizon.net (donaho1(at)verizon.net)> wrote:
| Quote: | When I built my FSII, the plans didn`t call for inspection rings. Can they be retrofitted on fabric that has already been shrunk and painted? I still have fabric and paint. So all I would need is Poly-brush and the rings, correct? N598LF
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Zulu Delta
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elleryweld(at)aol.com
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| Posted: Thu Dec 20, 2012 3:26 pm Post subject: Retrofitting inspection rings |
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Use polytak glue
Ellery Batchelder Jr.
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wakataka
Joined: 11 Aug 2012
Posts: 48
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| Posted: Thu Dec 20, 2012 4:20 pm Post subject: Re: Retrofitting inspection rings |
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Let me preface this by saying I haven't done it this way myself yet, but I really trust the guy who gave me the information. He's a Reno racer who's built or rebuilt more than a dozen fabric airplanes. He say's the best way to retrofit inspection ports is to use Liquid Nails silicone adhesive that you can buy at Home Depot. It doesn't wrinkle the paint like Polytak will do. He puts the adhesive on both inner and outer rings and then clamps them together using Cleco Clamps, which are small little clamps that you can set using Cleco pliers. You need a lot of clamps (maybe 10 or 12) to keep the rings from wrinkling. He's been doing it this way for many years and has done test sections on spare pieces of fabric to test the bond. He claims it's stronger than Polytak. I bought the materials to put in some inspection plates in my Firestar but haven't gotten around to doing it yet.
I should add that it's not the adhesive that comes in the big tubes you use in a caulking gun. It's a little 4 ounce tube that they have in the paint department.
I figure if it will hold up on a Reno racer, it will probably do OK on my Firestar.
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Thu Dec 20, 2012 4:28 pm Post subject: Retrofitting inspection rings |
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He claims it's stronger than Polytak. I bought the materials to put in some
inspection plates in my Firestar but haven't gotten around to doing it yet.
--------
There is something fascinating about science. One gets such wholesale
returns of conjecture out of such a trifling investment of fact.
Mark Twain
Let us know how it works out.
john h
mkIII
Titus, Alabama
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Fri Dec 21, 2012 9:17 am Post subject: Retrofitting inspection rings |
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Wakata, all, NEVER, NEVER, NEVER use any product containing silicone on any painted surface or surface you will paint later. Silicone CANNOT be removed, EVER! Silicone is like molecular ball bearings, you cannot remove it by any method. Sanding or wiping simply spreads the contamination around. Nothing sticks to it so any contaminated surface cannot be painted effectively. Ask an autobody painter. They have a special primer that attempts to encapsulate the silicone and it works well enough to get the job out the door, but long term, the paint will come off. I spent many days in Boeing training classes getting certified to inspect sealing. Boeing practices complete segregation of silicone sealants and tools that are used to apply them. Their only regular use for it is to install windows and only then because they have never found anything that will handle the temperature and pressurization cycling to which an aircraft is subjected. Their painters hate the stuff almost as much as they hate rivet tape.
If you're not convinced, do this experiment. Take some RTV and lay down a bead on a piece of scrap and let it cure. Spray with primer and watch what happens. The primer coagulates but doesn't stick.
Rick Girard
On Thu, Dec 20, 2012 at 6:20 PM, wakataka <wakataka(at)charter.net (wakataka(at)charter.net)> wrote:
| Quote: | --> Kolb-List message posted by: "wakataka" <wakataka(at)charter.net (wakataka(at)charter.net)>
Let me preface this by saying I haven't done it this way myself yet, but I really trust the guy who gave me the information. He's a Reno racer who's built or rebuilt more than a dozen fabric airplanes. He say's the best way to retrofit inspection ports is to use Liquid Nails silicone adhesive that you can buy at Home Depot. It doesn't wrinkle the paint like Polytak will do. He puts the adhesive on both inner and outer rings and then clamps them together using Cleco Clamps, which are small little clamps that you can set using Cleco pliers. You need a lot of clamps (maybe 10 or 12) to keep the rings from wrinkling. He's been doing it this way for many years and has done test sections on spare pieces of fabric to test the bond. He claims it's stronger than Polytak. I bought the materials to put in some inspection plates in my Firestar but haven't gotten around to doing it yet.
--------
There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact.
Mark Twain
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Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
[quote][b]
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