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I have ordered the Cruzer kit to be delivered first part of March.
Having built an RV9A years ago and using pro seal liberally throughout construction where skins join ribs I wondered if builders are doing anything similar in building their Zenith aircraft. I had attended a builder workshop for 3 days taught by a former Lockheed employee who advocated the use of pro seal in addition to fuel tank sealing in construction of all types of aluminum skinned aircraft. It seemed to work fine on my RV.
Is that a reasonable strategy or a waste of time for my Cruzer?
Hey Lance, pro-seal isn't typically used, so if it isn't broke don't fix it. Don't see any real advantage, and if you ever need to repair it for any reason you'll have a hard time getting it apart. One of the amazing benefits of owning a Zenith is the simplicity of build AND repair. -Alissa
Having built a RV9A, you've likely got the Proseal application down pat, but seems to me it would be relatively expensive, messy, and unnecessary! The 6061T6 aluminum Zenith uses is naturally corrosion-resistant, but a lot of builders at least apply corrosion protection to mating surfaces such as ribs/skin, etc. Zenith sells and recommends Cortec, a non-toxic corrosion preventative. Normally, Cortec is only available in very expensive, industrial quantities (I think 5 gallons is the smallest amount available?), but Zenith re-packages it in quart containers - one quart will be more than enough for all the mating surfaces on the Cruzer.
I thin Cortec in small disposable lab sample cups with lids and apply it with disposable foam brushes. An engineer at Zenith told me to thin it (with water) to a consistency so that it would leave a thin film and spread easily. If you keep the film thin, it dries quickly. You can assemble parts with it still wet, but when it dries it acts like a glue, so only assemble parts with wet Cortec that are a final assembly.
I’m very curious what advantage might be achieved using proseal. I have built an 801, and I’m currently working on a RV-14A. As John pointed out, I think there are easier and lighter ways to protect against corrosion if that is the goal. But maybe I’m missing something.... what’s the goal you are looking to a achieve?
I agree w John...Cortec is the way to go. I think you'd also be adding unnecessary weight applying proseal everywhere aluminum meets. On a previous build I used a polyurethane sealant (like a silicone) between the aluminum (more as a waterproffing feature than anything else) and I did have to do some repairs...I essentially had to replace some parts because I could not get them apart...so I do not recommend it.
For my part, is something I found overkill vs adding little strengthening to the wing:
1) Not pleasant to applyed, dirty and messy the construction;
2) Add weight
3) If you have to rebuild or re-assembly some part, hard to remove pieces to made repairs, this is not funny. You cannot retired .0025 sheet without scrapt the sheet.
I prefer apply an epoxy primer like Dupond formula. Help again corrosion. Better time investment.
My humble opinion
CH640 -0059 from plan.
I think some confusion arise about this topic and discussion following responds.
In the original post from Lance, he don't mention in his question that he was tinking about use pro-seal for ribs-skin gas tank sealer, if it was his question, sure, we should use kind of pro-seal stuff for that kind of joints.
Christian has hit the nail on the head. We need to know the goal being pursued to provide meaningful advice.