Sanding balsa joints  
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Sanding balsa joints - 6/4/2008 3:13:45 AM   
Richard Scale Rocks


 

Posts: 71
Joined: 5/20/2008
From: Hammond, ON, CANADA
Status: offline 		Hey guys! Looking for some ideas for fillers. I always have a hard time finding a material that has the same sanding properties as balsa wood. Please pas on you experience.

Thanks

Build On!

_____________________________

Keep on building!
       Post #: 1

RE: Sanding balsa joints - 6/4/2008 4:33:05 AM   
DAN REISS


 

Posts: 215
Joined: 12/15/2002
From: MANHATTAN BEACH, CA, USA
Status: offline 		Try the different model fillers that the hobby industry has available. They are water based and sand easier than balsa wood. Put them on after you are done sanding the balsa. The problem with them is that they have no strength and crumble if you get them around a 1/8 of an inch thick. Use a mixture of E-Z Poxy Finishing Resin and Sig micro-balloons for those deep voids. This mixture is strong but is tougher to sand. Build it up to within 1/16 inch of the final surface and then use the balsa filler. Super Fil is a light weight epoxy filler that is somewhat easy to sand. You can get it from Aircraft Spruce and Specialty. Go easy with the epoxy fillers or else you will have a hard time sanding them ext to the balsa. Get some of the fillers that the construction industry uses for wallboards. I've used these also. Dan.

(in reply to Richard Scale Rocks)
       Post #: 2

RE: Sanding balsa joints - 6/4/2008 4:47:50 AM   
BMatthews



Posts: 8943
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		I like the lightweight wall filler you can buy at the local hardware store. You'll know you have the right one when you lift up the container and it feels like there is nothing inside it. It's premixed and ready to use straight from the container. If it thickens too much a LITTLE water will return it to a great consistency. Once dry it sands about the same as a light grade of balsa so it blends extremely well. The only thing I found it doesn't do well is to spread out in a very thin coat and feather out the edges like the regular but very heavy drywall mud can do.

I won't give a brand name since the names change from region to region and the one I've got isn't sold anymore but I've still seen the lightweight stuff here and there.


_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........

(in reply to DAN REISS)
       Post #: 3

RE: Sanding balsa joints - 6/4/2008 11:27:14 PM   
dhal22


 

Posts: 1218
Joined: 8/28/2006
From: Roswell, GA, USA
Status: offline 		i can't believe that drywall mud can be used but it can. some very accomplished scale builders have used it much to my amazement.

david

(in reply to BMatthews)
       Post #: 4

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