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  #1  
Old 03-28-2013, 07:13 AM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,376
Default Question for the fiberglass experts

I am working on a layup where the top layer will be carbon fiber. As long as I don't screw it up I would like to show the CF by sanding and adding a clearcoat to the finished part.

Is it a good idea to still use peel-ply on top of the layup? I figured the peel ply could soak up some excess resin and leave a more even finish, but it may be a pain to sand it smooth enough to cleacoat.

Also, the part is mostly flat can I use one large piece of peel-ply, or should I stick to strips. The strips will probably leave a seam mark, but one large piece may be difficult to remove.

Maybe I'll build a composite plane one of these days. I don't know what I am doing, but having a lot of fun doing it...haha

Thanks,
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  #2  
Old 03-28-2013, 07:39 AM
g zero g zero is offline
 
Join Date: Jun 2007
Location: palm coast fl.
Posts: 1,061
Default Carbon

I would use some thick clear plastic wrap , like constuction vapor barrier . Easy to see the epoxy under as you squegge the last layer .Just did this on my 8 windscreen bezel .
Tom
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  #3  
Old 03-28-2013, 09:24 AM
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RV7Guy RV7Guy is offline
 
Join Date: Jan 2005
Location: Chandler, AZ
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Default No need

If you are going to clear coat there is no need to use ply peel. Brush on your epoxy without using too much. From there you can sand from 320 down to about 600 to get the finish you want. Then go to 320 again before clear. Add lots of clear and wet sand down to 3000 if you want that glass look.

I've made several carbon parts for my plane with this process. Works great.
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  #4  
Old 03-28-2013, 10:57 AM
WingsOnWheels WingsOnWheels is offline
 
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Default

Thanks all for the advice. I'll leave the peel-ply on the shelf!
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  #5  
Old 03-28-2013, 06:53 PM
deek deek is offline
 
Join Date: Mar 2013
Location: Flathead Lake Montana - 8S1
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Default

3 LongEZ's builder here so my advice would also be to leave the peel ply off as it tends to create waves in the layup under carbon. Also, wet layups with carbon make it tough enough to judge wetting out even without peel ply. If this isn't primary structure you will save yourself some work by keeping it "lean".
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  #6  
Old 03-28-2013, 10:12 PM
WingsOnWheels WingsOnWheels is offline
 
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Default

Quote:
Originally Posted by deek View Post
3 LongEZ's builder here so my advice would also be to leave the peel ply off as it tends to create waves in the layup under carbon. Also, wet layups with carbon make it tough enough to judge wetting out even without peel ply. If this isn't primary structure you will save yourself some work by keeping it "lean".
Very good advice also. This is not primary structure, so going a little light on the resin for the last layer is a good idea to improve the finish.
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