VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.






VAF on Twitter:
@VansAirForceNet


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 03-28-2013, 07:13 AM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,363
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,
__________________
Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec)
Reply With Quote
  #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
__________________
Rv8
N 666 TA
First Flight 2-3-2015 🚀
Reply With Quote
  #3  
Old 03-28-2013, 09:24 AM
RV7Guy's Avatar
RV7Guy RV7Guy is offline
 
Join Date: Jan 2005
Location: Chandler, AZ
Posts: 3,096
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.
__________________
Darwin N. Barrie
Chandler AZ
www.JDair.com
RV-7 N717AZ Painted and Complete
2021 Outstanding Workmanship Sun N' Fun
2021 Gold Lindy Grand Champion Kit Plane
2022 Copperstate Fly in Grand Champion/Best Metal
2022 Reserve Grand Champion Sun N' Fun
Reply With Quote
  #4  
Old 03-28-2013, 10:57 AM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,363
Default

Thanks all for the advice. I'll leave the peel-ply on the shelf!
__________________
Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec)
Reply With Quote
  #5  
Old 03-28-2013, 06:53 PM
deek deek is offline
 
Join Date: Mar 2013
Location: Flathead Lake Montana - 8S1
Posts: 393
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".
Reply With Quote
  #6  
Old 03-28-2013, 10:12 PM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,363
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.
__________________
Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec)
Reply With Quote
  #7  
Old 03-29-2013, 09:51 AM
FresnoR's Avatar
FresnoR FresnoR is offline
 
Join Date: Oct 2008
Location: Seattle, WA
Posts: 494
Default

Make sure you use the proper epoxy. They have some mixes that are extra clear for carbon fiber use
__________________
Rick from Seattle
RV-7A
Wannabe RV-15


The art to flying lies in learning how to throw yourself at the ground and miss.
Reply With Quote
  #8  
Old 03-29-2013, 01:00 PM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,363
Default

Im using polypoxy which is pretty close to water clear.
__________________
Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec)
Reply With Quote
  #9  
Old 03-29-2013, 01:36 PM
Cfrisella's Avatar
Cfrisella Cfrisella is offline
 
Join Date: Aug 2008
Location: Sun city, Ca.
Posts: 255
Default

If the shape allows this is what I've done. First make your basic part with fiberglass or carbon to your working thickness. Then sand and fill the surface like you were going to paint it. Then, apply on more layer of carbon to serve as your cosmetic layer. Only put enough resin on so the material is saturated but not puddling. Once this is cured sand it down and apply ebony colored timber mate. Then dry sand with 320 or so. Don't wash in water but acetone is fine. Then clear coat and see how looks. Your parts will look like they came out of molds.
__________________
Cheers,
Chris Frisella
Www.boneheadcomposites.com
Reply With Quote
  #10  
Old 03-30-2013, 02:50 PM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,363
Default

Thanks everyone for the advice. I did my layup last night and it came out great. I hope I made it strong enough, but I can always add another layer if need be.

From bottom to top, here is my layup.

Lightweight BID - 5.79oz cloth
Carbon Fiber - 5.8oz cloth
Heavyweight Double-bias nitted fabric - 17.6oz cloth
Carbon Fiber - 5.8oz cloth

Everything was done in one shot, whle the resin was still liquid. I really like that PolyEpoy since it has a very long pot life. It is really easy to work with and wets out very well without being too thin.

__________________
Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec)
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 06:32 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.