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-   -   RV-12 back window sealant (http://www.vansairforce.com/community/showthread.php?t=99480)

JRo 05-08-2013 06:55 AM

RV-12 back window sealant
 
I'm looking for a recommendation on sealant for the RV-12 back window. The large concern seems to be fuel seepage, but I'm concerned, as well, with appearance. This sealant can obviously be seen through the Lexan, and all fuel sealants I've encountered are black. My RV is white, so hoping for a product that might blend better.

Also, looking for hints on tightening the rear window hardware which will never cause crazing or cracking around the holes in Lexan.

JRo

f1rocket 05-08-2013 02:26 PM

Can't help you on the sealant. I've never found it necessary on any of my previous airplanes.

The most surefire way to avoid cracking involves a couple of steps during construction. First, always use a drill bit for plexiglass and go slow. Second, countersink with sufficient depth to ensure the skin will fully nestle down in the countersink without touching the plexi. Then third, overdrill the hole size to allow for a short piece of rubber tubing to fit over the screw shaft as it passes through the plexi. This seems to work for me and all my previous projects.

tadsargent 05-08-2013 03:36 PM

window sealant
 
I used Lexel on my 7.

http://www.123ponds.com/adh-5.html?g...FStyQgodYVsAmA

txaviator 05-08-2013 03:54 PM

Quote:

Originally Posted by tadsargent (Post 769191)

I saw some of this Lexel today, at my local Ace Hardware store.

skydiverlv 05-08-2013 05:01 PM

According to manufacturer, gasoline will dissolve the polymers in Lexel. Not a wise choice for the 12

tboyett 05-08-2013 10:14 PM

Maybe a bit of a stretch...
 
Anybody heard of or used this stuff?

http://www.eclecticproducts.com/sealall.htm

RFSchaller 05-08-2013 11:30 PM

That fast set time (2 - 3 min) would worry me. It seems it would be hard to work with.

I've had my RV flying a little over a year and haven't had any of the fuel spillage issues. My painter used a thin bead of what appears to be grey RTV where the plex and skin meet. There is nothing applied between skin and plex overlap area. A lot of guys here on the forum think eventually I will have problems, but so far so good.

If it ever needs replacement I intend to buy a sheet of Lexan at Home Depot and use the old window as a template to cut another one.

rvbuilder2002 05-09-2013 09:13 AM

Quote:

Originally Posted by RFSchaller (Post 769319)
If it ever needs replacement I intend to buy a sheet of Lexan at Home Depot and use the old window as a template to cut another one.

Wouldn't be hard to do but the Home Depot Lexan will be even more vulnerable to damage than what is supplied in the kit. The kit supplied window has a protective surface coating on it that common Lexan sheets don't have.

RFSchaller 05-09-2013 12:33 PM

Scott, I never said it would work, just that I'll try it! :-)

rvbuilder2002 05-09-2013 01:55 PM

Quote:

Originally Posted by RFSchaller (Post 769427)
Scott, I never said it would work, just that I'll try it! :-)

And I never said it wouldn't.

Just letting the masses know that the RV-12 rear window is not made out of the same material you would buy at Home Depot. It is actually a material used extensively by NASCAR.


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