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Microballoon confusion - 6/15/2008 3:03:52 AM   
Richard Scale Rocks


 

Posts: 71
Joined: 5/20/2008
From: Hammond, ON, CANADA
Status: offline 		Hey guys! Just picked up the Top Flight Micoballoons but I'm confued. I read in other threads and in the instructions that when mixed with epoxy, it sands better. Question is.....does it make the epoaxy sand reasonably well? I've never been able to sand epoxy with any accuracy. The suff is so hard. Why would air bubbles within the epoxy make it a nice sanding job?

Richard

Keep on Building, ARF's stink!

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RE: Microballoon confusion - 6/15/2008 3:32:01 AM   
longdan



Posts: 495
Joined: 10/18/2006
From: Auckland, NEW ZEALAND
Status: offline
quote:

Why would air bubbles within the epoxy make it a nice sanding job?


They just do. Epoxy by itself is very hard to sand. When it's filled with bubbles, there's less epoxy to sand.

(in reply to Richard Scale Rocks)
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RE: Microballoon confusion - 6/15/2008 3:58:26 AM   
Jim_Purcha



Posts: 1024
Joined: 9/18/2003
From: La Salle, MB, CANADA
Status: offline 		Instead of having just a blob of solid cured epoxy to sand, the epoxy is binding the micro balloons together. When you sand, you are more removing micro pieces of epoxy between the microballoons. Does this help. I've made fillets with poly resin and microballons. Sands easy but still very tough.

Jim

(in reply to longdan)
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RE: Microballoon confusion - 6/15/2008 4:16:22 AM   
Richard Scale Rocks


 

Posts: 71
Joined: 5/20/2008
From: Hammond, ON, CANADA
Status: offline 		Thank Guys! Great help! Now for a really stupid question. Where would I gat poly resin? What form does it come in. Is it like Sig Lite Coat dope?

Regards,

Richard

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RE: Microballoon confusion - 6/15/2008 4:29:11 AM   
Props4ever


 

Posts: 1482
Joined: 8/3/2005
From: Canada, ON, CANADA
Status: offline 		I guess i could try same myself also, i've been using fumed Silica mixed with Aeropoxy resin on my Connie project, it fills nicely but very hard to sand it, you really have to have alot of elbo grease and good cutting sanding paper to work with it. In the end you do get super smooth and hard surface but, it big "B" to sand!!..Would microbaloons make Aeropoxy resin smoother to sand??

(in reply to Richard Scale Rocks)
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RE: Microballoon confusion - 6/15/2008 5:17:30 AM   
Chad Veich



Posts: 2805
Joined: 12/13/2001
From: Litchfield Park, AZ, USA
Status: offline 		If you want it to sand really nice mix the microballoons with finishing resin instead of epoxy. Takes a lot longer to dry but sands and carves very nicely.

Chad Veich

(in reply to Props4ever)
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RE: Microballoon confusion - 6/15/2008 5:20:55 AM   
Props4ever


 

Posts: 1482
Joined: 8/3/2005
From: Canada, ON, CANADA
Status: offline
quote:

ORIGINAL: Chad Veich

If you want it to sand really nice mix the microballoons with finishing resin instead of epoxy. Takes a lot longer to dry but sands and carves very nicely.

Chad Veich


What type of finishing resin are you talking about?

Polyester resin

Epoxy resin

I can't use poly resin on my model as it won't work with epoxy resin if that is what finishing resin is...

(in reply to Chad Veich)
       Post #: 7

RE: Microballoon confusion - 6/15/2008 2:55:39 PM   
Rodney



Posts: 4774
Joined: 12/8/2001
From: FL
Status: offline 		There are two cautions to take to make sure things work well with micro balloons. First, use a slow epoxy, 30 minute or more. Second, thoroughly mix the epoxy parts together before adding the micro balloon. Add the balloons until you get a rather stiff mix, about like peanut butter. Note: you can get two types of micro balloons, white or brown. The white ones are fiberglass, the brown ones are plastic; both work well but the white is better under most coverings (doesn't show through).

(in reply to Props4ever)
       Post #: 8

RE: Microballoon confusion - 6/15/2008 7:02:52 PM   
Chad Veich



Posts: 2805
Joined: 12/13/2001
From: Litchfield Park, AZ, USA
Status: offline
quote:

ORIGINAL: Props4ever


quote:

ORIGINAL: Chad Veich

If you want it to sand really nice mix the microballoons with finishing resin instead of epoxy. Takes a lot longer to dry but sands and carves very nicely.

Chad Veich


What type of finishing resin are you talking about?

Polyester resin

Epoxy resin

I can't use poly resin on my model as it won't work with epoxy resin if that is what finishing resin is...



I use epoxy finishing resin and the Zap brand (Z-poxy) is my preferred choice.

< Message edited by Chad Veich -- 6/15/2008 7:03:43 PM >

(in reply to Props4ever)
       Post #: 9

RE: Microballoon confusion - 6/15/2008 7:49:14 PM   
ss40


 

Posts: 38
Joined: 2/9/2008
From: Sorrento, BC, CANADA
Status: offline 		Actually I believe the white microballoons are glass and quite difficult to sand compared to the red/brown phenolic plastic ones.

(in reply to Chad Veich)
       Post #: 10

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