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Sep 22, 2010, 02:16 PM
chronic in training
grfcon's Avatar
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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Sep 22, 2010, 04:21 PM
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Woodstock 1's Avatar
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.
Sep 22, 2010, 05:07 PM
Registered User
garyg4rc's Avatar
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
Sep 23, 2010, 10:33 AM
chronic in training
grfcon's Avatar
thanks Gents I'll give it a shot!!
Sep 23, 2010, 10:57 AM
Flagstaff, AZ
dawsonh's Avatar
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.
Sep 23, 2010, 11:24 AM
chronic in training
grfcon's Avatar

thx Dawson...


I will get a can of the 90 and give it a try. thanks for your help.
Last edited by grfcon; Sep 23, 2010 at 11:37 AM.
Sep 23, 2010, 12:57 PM
Registered User
rockbus's Avatar
Quote:
Originally Posted by garyg4rc
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....
Sep 23, 2010, 05:03 PM
Sane til the lift starts!
kpeevyhouse's Avatar
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.
Sep 23, 2010, 06:01 PM
Lover of fast slope gliders!
glasairIII's Avatar
3m90

I've seen the results. Impressive.
Sep 23, 2010, 06:04 PM
Registered User
Daemon's Avatar
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
Sep 23, 2010, 06:17 PM
Lover of fast slope gliders!
glasairIII's Avatar
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
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
Sep 23, 2010, 06:20 PM
Flagstaff, AZ
dawsonh's Avatar
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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