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Old Jun 12, 2015, 07:16 PM
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Question
How to cover pink foam?

What would be the best method for covering dow pink foam? I know that this question has probably been answered many times before, but so far I see packing tape and ultrakote as my only options, and neither are very appealing. Packing tape still lets the pinkness of the foam show through and ultrakote is heavy, expensive, and easy for me to botch.
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Old Jun 12, 2015, 07:33 PM
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Lots of guys use document laminating film and then paint it afterwards.


Mark
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Old Jun 13, 2015, 06:23 AM
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If you want it for strength and a hard finish, fibreglass and finishing resin works well.

Gord.
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Old Jun 13, 2015, 07:52 AM
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Thanks!
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Old Jun 13, 2015, 08:18 AM
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I use wbpu and coffee filters for a poor man's glassing. Others use newspaper the same way. Once the covering is on, you can paint with anything to hide the pink. I use walmart buck a can spray paint once i have covered planes.
Both of these planes are made from Model Plane Foam, so they are white to start, but after covering i sprayed with rattlecans. The spitfire is rustoleum ultracover 2x. They had the best camo match, but it went on heavy, so i had to add weight to nose to get cg back to correct location. The mustang is walmart colorplace $1/can orange and silver. It is thinner and lighter weight. You do need to watch with all coverings and paints how much the added weight shifts cg aft and compensate. I try to set my planes up nose heavy if I plan to cover them.
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Old Jun 13, 2015, 08:50 AM
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Mike Spring, Do you have links to those planes?
Thanks
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Old Jun 13, 2015, 09:35 AM
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How exactly does the wbpu and coffee filter method work? I couldn't find anything on it after a quick search.
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Old Jun 13, 2015, 10:37 AM
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Just wet the planes surface with the water base, wet the filter good and apply. Wipe off most of the excess. It helps to pre cut also.Just let it dry. Some people have had warpage problems, myself ,I have not. Careful not to overlap too much. It just takes away from the flat look.
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Old Jun 13, 2015, 12:47 PM
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I do it a bit differently. Using a 1" nylon artist brush, lay a coat on the area i am working (as c.sitas said). Next i lay the filter on dry and pat it down. Then i lay a second coat on the filter to wet it out. Once everything is saturated, i work out wrinkles that always form. I wear disposable gloves and work the brush and finger tips to smooth. Sometimes have to pick up and rearrange, of course. It does help to pre cut to rough shape. A second coat after the first dries adds shine and smooths out the surface. It is a bit fiddly to do, but with practice goes pretty fast. One trick to avoid warping is to do both surfaces of wings and tail empennage at one sitting. Then they cure equally.
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Old Jun 13, 2015, 12:52 PM
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Basic: aha! So i tempted you again? The spit is the OSP-S and is in the "list of onesheeters so far" on my blog. The Mustang may be there too, i forget if i finished posting pdf's of it. It is really still a work in progress, i will admit.
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Old Jun 13, 2015, 05:59 PM
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Yes the Edge is still a work in progress. I do like your designs.

Not as worried about finish as some, At 50' they all look the same.

Have built 2 other 3D type of planes in the last two weeks that have me intrigued. They handle really different. Running the rudder is so important.
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Old Jun 13, 2015, 06:59 PM
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Yup on the Edge, if i fly at half throttle, i can use just ailerons & elevator, but as i slow down, the rudder input is important.
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Old Jun 13, 2015, 10:30 PM
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Quote:
Originally Posted by Decroxx View Post
What would be the best method for covering dow pink foam?
Losta ways :-)
1) Silkspan applied with water diluted white glue
2) Masking paper applied with watered white glue
3) Glass cloth applied with Polycrilic water based polyurethane
4) glass cloth applied with EzeKote (best of all finishes..imo)
5) glass cloth applied with laminating epoxy.
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Old Jun 13, 2015, 10:55 PM
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I tried covering a wing with silkspan and white glue. As it shrunk it created a lot of warpage. Have you had this problem Bare?. The composite won't shrink appreciably but has to be pretty thin.
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Old Jun 14, 2015, 07:03 AM
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My experience is the aliphatic resin in white glue shrinks more than the urethane resin in wbpu or polycrilic as each cures.
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