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  #1  
Old 12-07-2009, 09:27 PM
Stuart's Avatar
Stuart Stuart is offline
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Default Different Epoxy for finishing

I was curious if anyone changed epoxy for the finishing of their airplane, for easier sanding and finish, I know different epoxys sand differently, most likely with different amounts of effort and charicteristics..... The stuff I am using from aircraft spruce is really strong, and I was thinking if a better finish epoxy was out there it might save me a lot of sanding.

Does anyone finish pieces as they go along, like get the canard all sanding and shaped before they put it on the plane ???

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Old 12-07-2009, 09:51 PM
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Jerry Schneider Jerry Schneider is offline
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Default Re: Different Epoxy for finishing

I used Alphapoxy, as recommended by Jeff Russell of AeroCad fame.
The reasons were:
1. Passes the "thumbnail" hardness test.
2. Sands easier than structural.
3. Cheaper than most other epoxies.
4. Ships non-hazardous.

It seemed to work well for me.
If you want to save even more money, get the 5 Gallon kit of Velocipoxy from Velocity. I've been told it's the exact same thing from the same company.
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  #3  
Old 12-07-2009, 09:54 PM
ZG4Me ZG4Me is online now
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Default Re: Different Epoxy for finishing

Several (all?) use something like West for finish micro. It's a bit cheaper than MGS/Pro-Set, and 'they' say it sands better too.

As far as the canard, I did the Wayne Hicks Sled method. Fill and sand both top and botom to contour BEFORE you set the elevator hinges into the canard. It really is a pain to contour the bottom after the hinges are floxed in.

I'll update my website shortly. Chapter 10 is up, but no pictures of the sled process.

Rick
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  #4  
Old 12-07-2009, 10:13 PM
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Stuart Stuart is offline
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Default Re: Different Epoxy for finishing

Thank you so much for the information, the stuff I am using takes a lot of effort to sand, I would look like popeye if i did the entire plane in it.
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Old 12-08-2009, 01:36 PM
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Default Re: Different Epoxy for finishing

I used MGS for two reasons. The bonding properties and resistance to heat is higher than West so I thought, "less chance for cracking, etc. in extreme temp. changes where I live. The other is I have lots of it and I didn't have to wait for shipping and testing other epoxies. Well, MGS is like rock when hard, doesn't cheese grate well, and gums up a coarse sander at the "halfway" point of curing like sticky rice. During the "epoxy coating" filling the epoxy flows too much down the vertical surfaces.

I researched better finishing and ended up getting advice from an expert and professional painter. The man has finished several composite planes and has received awards for his work on planes and cars. He knows what he's talking about. He says GO WEST. End of story for me.
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  #6  
Old 12-08-2009, 03:22 PM
argoldman argoldman is offline
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Default Re: Different Epoxy for finishing

I used AEROPOXY LIGHT.

It is much like bondo, even looks like it, but is epoxy based. Good consistant mixes, blends with already hardened aeropoxy light without edges, hardens hard and shapes easily with 40grit paper.

For those of you who remember the old Advertisement,"makes housework almost nice"
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  #7  
Old 12-09-2009, 01:26 AM
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Default Re: Different Epoxy for finishing

I used the West system on my Longeze. It was eze to sand and if you caught it right the cheese grater worked good. Also a plus a pretty white finish. It also has a fast hardner so in the summer you could put it on in the morning and sand that afternoon a go again. Much faster than waiting a whole day. I am using eze poxy on the airframe it is pretty rough sanding I am going to try some of the epoxy that Jerry Schnieder used Alpha poxy. I want to see how it sands and cures If I like it I will do the whole plane in it. I like the fact it is cheaper than everything else and no haz mat charges to mail. Steve building on
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Old 12-09-2009, 01:35 PM
Buly Buly is offline
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Default Re: Different Epoxy for finishing

As a proud member of the lowest common denominator, I would go for the least expensive EPOXY with slow hardener for the fill/finish part.I bought epoxy from a boat supply wholesaler and it worked fine. 99% ends up on the floor anyway. Whatever you do, do not use any polyester/vinyl ester based materials. They are cheap and easy to work with, but you'll be very sorry later.
I even used epoxy based primers.
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  #9  
Old 12-09-2009, 02:55 PM
argoldman argoldman is offline
Rich
 
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Default Re: Different Epoxy for finishing

Quote:
Originally Posted by Buly View Post
As a proud member of the lowest common denominator, I would go for the least expensive EPOXY with slow hardener for the fill/finish part.I bought epoxy from a boat supply wholesaler and it worked fine. 99% ends up on the floor anyway. Whatever you do, do not use any polyester/vinyl ester based materials. They are cheap and easy to work with, but you'll be very sorry later.
I even used epoxy based primers.
Come to think of it, Buly,

aren't we all proud members of the lowest common denominator group. No embarrassment there, we are all there by definition.
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