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  #1  
Old 08-13-2011, 10:48 AM
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Default Right Wing Primed

Finally sprayed some primer this morning. I'm using Awlcraft 2000. Sprayed a guide coat of gray first and then ~2 coats of white. I validated what is good and bad about my prep work and can now complete other sections that are in various stages of micro finishing. I had a few small areas with pin holes where I had done some recent micro touch-ups and hadn't recoated with pure epoxy. Its a good feeling to finally see something look like a real piece of an airplane. Now I just have to sand off most of the white primer and turn the wing back into a 'scalded dog'.
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Old 08-13-2011, 03:44 PM
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Default Re: Right Wing Primed

Looks good but Awlgrip 2000 looks like a topcoat.
http://www.awlgrip.com/products/sear...raft_2000.aspx
Wouldn't a primer or primer-surfacer work better? I expect they would be easier to sand than a topcoat. Nason (Dupont) has a 2K sandable primer I use in two colors, gray and buff.
http://pc.dupont.com/dpc/en/US/html/...-17_421-19.pdf

Lots of ways to skin this cat,though. At least you are done with sanding (I hope) and putting on paint. The end is in sight.
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Old 08-13-2011, 06:15 PM
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Default Re: Right Wing Primed

Kent,
You're right on their paint vs primer. Unfortunately I'm only in primer now and only on the right wing. Its Awl Grip's 545 epoxy primer (made in gray & white). Much more micro sanding to go...but today was a good day.
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Old 08-13-2011, 06:25 PM
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Default Re: Right Wing Primed

Nice "right wing." It's probably better to be "conservative" at this stage.
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Old 08-13-2011, 09:21 PM
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Default Re: Right Wing Primed

Great to be at that stage on your wing, Unk!
Lookin' good!
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Old 08-14-2011, 12:11 AM
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Default Re: Right Wing Primed

I am hoping to have my wings ready to prime in a couple more weeks. I have tried really hard to break up the sanding do a little here then work on something else. I hate the sanding micro part of building.
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Old 08-14-2011, 03:31 AM
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Default Re: Right Wing Primed

looking good bill, i was going to prime a wing this week but built a mount and installed the engine instead, so i figured id do the cowl and prim it .
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Old 08-15-2011, 12:59 PM
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Default Re: Right Wing Primed

Right behind ya' Unk. I would have been there but I learned a good and expensive lesson. I applied 4 coats of raw epoxy (MGS) Was okay until I started sanding. After sanding I blew off the dust with an air gun and noticed little bits of epoxy shredding off. I'd sand and leave a shiny area underneath. I ended up sanding off all the raw epoxy and re-doing much of the micro. Although I did the bottom of my fuse with descent results I re-applied the epoxy after the prior was tacky, about 4 hours. This time because of work, I waited about 10 - 12 hours between coats.

Lessons learned:

Use West instead of MGS. Although not tried, I believe its more sandable.
Do not let the epoxy fully cure between coats. Doesn't enable cross-linking.
If epoxy fully cures, sand betwen coats.
In my opinion 4 coats is not necessary. I noticed after sanding past the coats the epoxy still penetrates the pin holes. I'm sure 1 or 2 is fine.
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Old 08-16-2011, 01:50 AM
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Default Re: Right Wing Primed

I am using Alpha poxy to finish the plane. It is way easier to sand than the ez poxy I built the airframe out of. If I had to sand and airframe covered in micro from ez poxy. I would quit the finish thing and fly the plane with paint roller barn, paint. That stuff is way hard to sand. STeve build on
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Last edited by Big Steve : 08-16-2011 at 01:51 AM. Reason: Im a bad typer
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  #10  
Old 08-18-2011, 06:07 PM
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Default Re: Right Wing Primed

[quote=neverquit;65067] I ended up sanding off all the raw epoxy and re-doing much of the micro. [quote]

I hear ya. I had the tops of both wings, one strake and the turtleback covered in micro (using West) and sanded them all back down to fiberglass. Poor application technique on my part and I had too many bubbles in the micro. It was a fiasco. No matter how many times you read all the excellent micro finishing explanations, there's no substitute for OJT. I'm now a firm believer in using the epoxy pre-coat & squeegy off technique prior to applying micro. ---Been a lot of flying stories/maintenance discussion items lately---pisses me off to be stuck talking about micro & primer. Blah!
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