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How to seal inspection covers

Do a search, extensive discussion regarding use of proseal per Vans and Hylomar. Also method of releasing sealant from covers after curing
 
I tried the plastic wrap & Proseal method that vans recommends and was unhappy with the results. I scraped it all out and did round two with Proseal and a PVA mold release agent instead. They came out much better.
 
DanH says

Access Panel Seal

Sometimes I have an idea which actually works out well. Amazing, but true. Subject is the hatch kit for the forward top skin of a 7, 9, or 10. The OP-43 installation drawing suggests forming a proseal gasket by using a piece of plastic wrap. I tried it and wasn't satisfied; too many surface...
vansairforce.net
 
Not specific to this install, but a similar hatch on a boat I used a 1/16” ish thick rubber sheet from Amazon and cut my own gasket. I used the cover and traced it on the rubber. Cut the middle out to save weight and used a leather punch to make holes for the screws. Took all of 5 mins and it has yet to leak. The rubber sheet had some give and compressed nicely.
 
We used to "wet-seal" frequently accessed panels on Navy jets with the grey silicone RTV. Those RV-6/7 access panel kits are designed very similar to the ones I'm talking about. Just, on Navy jets they're a little bit beefier.
 
I used RTV and spread it thin with a finger on the aircraft side only, left the plate clean. Let it cure up completely and screwed it in place - no leaks in 1800 hours.
 
I just did this on my -7 and did a write up. I went with the plastic method. It’s not as clean as the pva method, but it will keep the panel sealed.
 
Instead of the plastic sheeting, you can cover the back side of the panel with some 2" clear or vinyl tape and run the screws down thru it. If you add a AN960 washer with an L code for thickness, you can form a gasket that is .016" thick or so. Just put the washer on between the tape and the sealant.
 
I used the Cth6 method. Thin rubber sheet from Amazon. Traced around the panel and cut out the middle. Used 3M weather strip adhesive with a weight on the panel till it cured and trimmed around it. Heated a nail to poke the fastener holes open. It installed pretty well and was very simple to do.
 

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KazooRV-9A said:
I used the Cth6 method. Thin rubber sheet from Amazon. Traced around the panel and cut out the middle. Used 3M weather strip adhesive with a weight on the panel till it cured and trimmed around it. Heated a nail to poke the fastener holes open. It installed pretty well and was very simple to do.
Click to expand...
What’s Cth6 and where do you get it? Didn’t get and definite returns when searching.
 
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