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Old Sep 22, 2010, 02:16 PM
chronic in training
grfcon's Avatar
L.A. beautiful san fernando valley
Joined Nov 2008
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Question
will new stuff stick to painted EPP?

I think I saw a mentioning that it would if one uses a very light coat of paint.

Question. If the paint it put on too thickly... is this what ruins the epp/laminate film bond?

thanks,

Gary
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Old Sep 22, 2010, 04:21 PM
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Woodstock 1's Avatar
Ireland, County Kerry, Kerry
Joined Dec 2005
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In my limited experience of using NS, it can stick OK. I painted portions of this EPP Fox (the smaller one!) with quite a thick few coats of acrylic paint, and so far so good.
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Old Sep 22, 2010, 05:07 PM
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Riverside CA
Joined Feb 2001
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Gary,
You can paint under NS but eventually it will come up. More so, in the areas of impact like the tips, leading edge and nose. If weights not a huge issue, you can lock in the paint with thinned goop then NS over that. If you are using layers of NS you can paint between layers. Good Luck!

Gary
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Old Sep 23, 2010, 10:33 AM
chronic in training
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L.A. beautiful san fernando valley
Joined Nov 2008
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thanks Gents I'll give it a shot!!
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Old Sep 23, 2010, 10:57 AM
Flagstaff, AZ
dawsonh's Avatar
USA, AZ, Flagstaff
Joined Mar 2003
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Chris Klique (ritewingsrc.com) recently built a bunch of wings using NS over painted EPP. Here is his build description...


build wing with all gear installed

sand wing nicely

spray 3 m 90 over entire wing ,then let dry

now paint without going to heavy and crazy, I use cheap spray paint.

let paint dry,then do another haze of 3 m 90 over the paint so the lam fill stick reall well.

let 90 dry for 1/2 hour or more.

if you let the 90 dry for a few hrs then you can sand it again as an option to make it even more smooth,but I usually dont,lol

Cut film for top in four pieces then use iron w out a sock, start with temp low at 225 F or so and work your way up.

Use wingbeds to lay wings in to keep them strait and tru ,then over lap the lam film joints 1/4 inch.

After you do a few wings you will be able to do the wing in less pieces.
Its easier to do more at first so you dont distort the wing learning..

The overlaps will disappear and the colors will really bling out even with the haze of 90 over the paint.

You can cover the bare balsa elevons or do the same 90 method with paint ,just no need to do the first layer of 90 on the balsa , just do the last one over the paint so the lam sticks well.
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Old Sep 23, 2010, 11:24 AM
chronic in training
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L.A. beautiful san fernando valley
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thx Dawson...

I will get a can of the 90 and give it a try. thanks for your help.
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Last edited by grfcon; Sep 23, 2010 at 11:37 AM.
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Old Sep 23, 2010, 12:57 PM
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Carlsbad, CA
Joined Sep 2004
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Quote:
Originally Posted by garyg4rc View Post
Gary,
If you are using layers of NS you can paint between layers. Good Luck!

Gary


Gary do you have a picture example of this?

Thansk

Ray

Going to redo my POS moth soon. The wings are gonna get trimmed and the fuse shaved....
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Old Sep 23, 2010, 05:03 PM
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Laguna Beach, CA
Joined Jun 2008
10,190 Posts
Are you sure it's 3M90, and not 3M77? It's been forever since I've used 90, but I seem to recall that it comes out really stringy and lumpy, not as a mist.
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Old Sep 23, 2010, 06:01 PM
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United States, AZ, Goodyear
Joined Apr 2004
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3m90

I've seen the results. Impressive.
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Old Sep 23, 2010, 06:04 PM
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Lakewood, Colorado
Joined Aug 2002
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Covering the bare foam with 3m90 makes sense to fill the gaps, but a "haze of 3m90" does
not, since as mentioned above, it comes out all stringy and you basically have
to smear it down smooth. I wonder if he's actually using 90 first then 77.

ian
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Old Sep 23, 2010, 06:17 PM
Lover of fast slope gliders!
glasairIII's Avatar
United States, AZ, Goodyear
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All 3m90. When you apply the heat to the film the 3m90 goes clear. Let's the paint shine through the covering.

Quote:
Originally Posted by Daemon View Post
Covering the bare foam with 3m90 makes sense to fill the gaps, but a "haze of 3m90" does
not, since as mentioned above, it comes out all stringy and you basically have
to smear it down smooth. I wonder if he's actually using 90 first then 77.

ian
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Old Sep 23, 2010, 06:20 PM
Flagstaff, AZ
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USA, AZ, Flagstaff
Joined Mar 2003
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Chris mostly uses 3M-90. The 77 tends to de-lam in the heat (Phoenix).

Use an old credit card or piece of coroplast to squeegee the 3M-90 smooth. It is pretty easy to get a nice thin layer. However you have to be fast since it starts to set up quickly... and become a sticky goopy mess.
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