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Post by Dillzio on Aug 31, 2009 16:26:10 GMT 1
Hi all,
I was wondering if anyone's tried painting their plane with styrene resin? It's the stuff that comes with fiberglass car body repair kits. For car body repairs, you make the general shape you want with fiberglass matting, then paint it with the resin (after adding catalyst) and it goes rock hard.
I think it's proper name is Styrene-acrylonitrile resin. I was thinking it would be good to go straight onto the Z-foam (no fiberglass matting). It sure is tough, but it might make it brittle too.
Anyone tried it?
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Post by flydiver on Aug 31, 2009 17:00:20 GMT 1
Maybe heavy? Eat foam? Cub foam is pretty tough but some are not. Stiff and brittle could be an issue. There is a lot of flex in the wings. A pretty common covering is Water Based Polyurethane: www.rcgroups.com/forums/showthread.php?t=176211The stuff is benign, pretty light, and easy to work with. |
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duck
Squadron leader
R/C Addict
Posts: 219
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Post by duck on Sept 3, 2009 17:35:46 GMT 1
the standard autobody resins will eat any foam. and they are heavy and brittle.
The WBPU is reported to work well, and I've heard of people using future floor wax.
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Post by duck9191 on Sept 3, 2009 21:18:18 GMT 1
you could use thinned epoxy.
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Post by Dillzio on Sept 4, 2009 5:45:40 GMT 1
you could use thinned epoxy. By Epoxy, do you mean the glue that you mix in two parts before using? If so, how do you dilute it, acetone? Also, do you add hardner to it too? |
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Post by coupe1942 on Sept 8, 2013 8:06:59 GMT 1
Older thread, but that is one great linked article to read on this process. I have a couple of different cowl pieces (as a newb I was expecting some damage to them from the get go, so I purchased a few in advance of my 1st flight). I am wondering if HobbyLite filler can be used with the resin to smooth it before painting?
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Post by coupe1942 on Sept 18, 2013 9:24:29 GMT 1
FYI only: I have recently coated my leading edges and tail bottom section with MinWax Polycrylic, clear satin, water-based coating. It dries quickly and does not show yellow. It is light weight when added to the plane and provides a hard coating. If you want to add strength to the cowl, you can add the fiberglass mat with it, preferably very thin mat that is not usually sold at the box stores or auto stores, but can be found at hobby shops. My first mod was on a spare cowl for my Cub. I had trimmed out the scoop to it and reinforced it all with the MinWax Polycrylic. I also used some reinforced fiber glass tape that is for putting mud/plaster on a wall. This added a grille effect to the openings of the cowl. It was easy to trim the excess mat away once dried. Like say, it added very little weight when finished. You do have to ensure you don't apply too much of this MinWax product, as it can run if you do so. It cleans up easily on the brush. No crashes to test this modified cowl yet, but it does not eat the foam and produces a really hard surface that takes a very good eye to even notice, as it dries very clear. Lowe's has recently stopped selling water-based products, so I got the last two cans of the stuff there. It has about doubled in price over the years, but a half pint can will last you for a long, long, long time. It also comes in a spray can, but I have not tried that method just yet. I am believing that applying a 1/2" coating of this MinWax Polycrylic onto the leading edges of the wings and such adds to the ability to keep the foam intact in most crashes. After it dries you can then add the packing tape to also help, but together it really does not add a significant amount of weight to the wings and all. I am currently working on my battery box reinforcement and will likely use some of this as I do that mod.
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