SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Jun 21, 2002, 03:54 PM
Registered User
Montreal, Canada
Joined Apr 2002
172 Posts
What are you guys using to fill gaps in foam ?

I was wondering what stuff I could use to fill smal gaps in foam structure of my tipsy (wing and fuselage).

Something light that is easily sandable...

What about Elmer's Pro Bond ?

My father told my to use Polyfilla... yeah right, the old man is not into RC that much. My Tipsy would be 20lbs if I listened to him...

Thanks for the tips !

Fred.
NetForce2K is offline Find More Posts by NetForce2K
Reply With Quote
Sign up now
to remove ads between posts
Old Jun 21, 2002, 04:05 PM
Registered User
member73's Avatar
Wakefield, MA
Joined Feb 2001
769 Posts
In my experience, I haven't found ProBond to be that easy to sand. Its much harder than the foam, so its difficult to get a nice flush finish. If you have a local hobby store nearby, get a tub of balsa filler (Hobbylity is Hobbico's version, there are several others). Very light weight, dries fairly quick and no harder to sand then most foams. If a LHS is not available, you can find light weight spackle at the hardware store. Not sure of the relative densities since I've never used the stuff, but I see it suggested here quite often and since everyone here is interested in every last gram, it must be pretty close. If you need a structural joint, mix microballons (available at the LHS) with epoxy to make a lightweight but strong filler. The microballons also make the epoxy a lot easier to sand.

Best of luck!
member73 is offline Find More Posts by member73
Reply With Quote
Old Jun 21, 2002, 04:17 PM
Registered User
Idaho
Joined May 2002
1,067 Posts
NetForce2k,

I've found that the very best filler material is none at all. I haven't found any filler that matches the texture of any of the foams. So, after filling and sanding, I have a more noticable seam or spot than I did before! Paint won't cover the textural differences. The only exception I can think of is if you planned to use a covering material like monocote after filling and sanding. Sometimes doing nothing is best.

JT
DEPENDS is offline Find More Posts by DEPENDS
Reply With Quote
Old Jun 21, 2002, 06:17 PM
Registered User
poobs's Avatar
oakdale, ny, usa
Joined Aug 2000
3,985 Posts
Light weight spakle from the hardware store. It feels like the can is empty when you buy it.
True that when you sand it it will not hae the granular testure of the foam.
poobs is offline Find More Posts by poobs
Reply With Quote
Old Jun 21, 2002, 07:20 PM
Registered User
mefly2's Avatar
New York Mills, MN
Joined Jan 2002
647 Posts
I haven't tried LW spackle on foam, but I do know it works great on balsa. The only problem is that the white will show through some coverings. I have had good luck using food coloring(yes, food coloring) like for coloring frosting for cakes. You can make the spackle any color you want by mixing the colors together. Just don't use to much...this stuff is very concentrated so a little goes a long way. I think you could make the spackling the same color or close as your plane, and it would look pretty good with out covering over it.
mefly2 is offline Find More Posts by mefly2
Reply With Quote
Old Jun 21, 2002, 07:26 PM
Registered User
Arlington,VA USA
Joined Jan 2001
1,862 Posts
I like probond for glueing foam....it fills in a little, but is very hard.

Has anyone ever tried that "foam-in-a-can" insulating stuff that is used for household applications? It is starts out as a goo out of the can, and quickly expands/dries into a light foam material.
pullin-gs is offline Find More Posts by pullin-gs
Reply With Quote
Old Jun 21, 2002, 08:57 PM
Registered User
mtayl's Avatar
Boulder, CO USA
Joined Sep 2001
1,405 Posts
I found probond to be an extreme pain to sand if it had foamed up a lot. Several people have said that once you put it on to take some strapping tape and lay it down hard where the probond is. This should keep the foaming action going into the wing instead of on the wing. I have to probond some CF mounts tonight so I'm going to try this and see how well it works.
mtayl is offline Find More Posts by mtayl
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
What do you guys use to fill dents in foam ramw5p Parkflyers 9 Nov 16, 2005 09:13 AM
Question What kind of receivers are you guys using in your ap planes? Picoflyer Aerial Photography 29 Aug 27, 2004 08:38 PM
E3D spinner; what are you guys using? jbrundt Sport Planes 2 Aug 30, 2003 12:12 AM
What receivers are you guys using? christianzx Electric Heli Talk 9 Oct 20, 2001 09:43 PM
What are you guys using for a heli test rig? HankF Electric Heli Talk 0 Jul 08, 2001 01:44 PM