Composites Fabrication And Repair Carbon Fiber, Kevlar, Fiberglass and all the newest high tech composites

sanding through glass

Reply
Old 10-31-2012, 10:44 AM
  #1
dbsonic
Thread Starter
 
dbsonic's Avatar
 
Join Date: Oct 2005
Location: san jose, CA
Posts: 789
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default sanding through glass

Any help would be appreciated. I have a situation where I built up too much glass and resin (cured now)close to the on the leading edge of a wing. The profile is critical to maintain and I need to sand down through the glass.

I know it sounds ugly but if the cloth is well saturated it should sand out right? The concern is the fraying that might occur and how to hide???

I am not as much concerned about the structure here as it will only be a small portion. Schedule in this area was 3oz+1.4oz+1.4oz+0.7oz with 0.7 at the surface. So that's about 6.5oz of glass and will probably need to go down to the 3oz base layer.
dbsonic is offline  
Reply With Quote
Old 10-31-2012, 11:10 AM
  #2
ByLoudDesign
 
ByLoudDesign's Avatar
 
Join Date: Sep 2005
Location: Mesa, AZ
Posts: 1,426
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: sanding through glass

To correct the fraying cloth fibers, use a thinned out mixture of the resin or epoxy and lightly coat the area. Allow it to cure totally and then sand off the stiffened fuzz!
ByLoudDesign is offline  
Reply With Quote
Old 10-31-2012, 02:11 PM
  #3
wyowindworks
 
Join Date: Jan 2011
Location: Cody, WY
Posts: 294
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: sanding through glass

If you use nice sharp sandpaper you shouldn't have any fraying issues. Use some fine grit to finish it off. Get ready to itch.
wyowindworks is offline  
Reply With Quote
Old 10-31-2012, 06:18 PM
  #4
speedracerntrixie
 
speedracerntrixie's Avatar
 
Join Date: Jun 2010
Location: Sacramento, CA
Posts: 5,483
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: sanding through glass


Quote:
ORIGINAL: dbsonic

Any help would be appreciated. I have a situation where I built up too much glass and resin (cured now)close to the on the leading edge of a wing. The profile is critical to maintain and I need to sand down through the glass.

I know it sounds ugly but if the cloth is well saturated it should sand out right? The concern is the fraying that might occur and how to hide???

I am not as much concerned about the structure here as it will only be a small portion. Schedule in this area was 3oz+1.4oz+1.4oz+0.7oz with 0.7 at the surface. So that's about 6.5oz of glass and will probably need to go down to the 3oz base layer.

If you need assistance we are in the same city. I pretty much have a full on composites shop in my garage.

speedracerntrixie is offline  
Reply With Quote
Old 10-31-2012, 06:53 PM
  #5
dbsonic
Thread Starter
 
dbsonic's Avatar
 
Join Date: Oct 2005
Location: san jose, CA
Posts: 789
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: sanding through glass

Thanks, I'am about to give it a shot here. I think it will work out okay.

Been a while since I was building and got a little rusty with my skills "glassing and bagging" and let the mylar ride a little too high on the LE.
dbsonic is offline  
Reply With Quote
Old 10-31-2012, 07:23 PM
  #6
speedracerntrixie
 
speedracerntrixie's Avatar
 
Join Date: Jun 2010
Location: Sacramento, CA
Posts: 5,483
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: sanding through glass

OK so you are a sailplane guy. South Bay Soaring member?
speedracerntrixie is offline  
Reply With Quote
Old 10-31-2012, 08:31 PM
  #7
Bozarth
 
Join Date: Apr 2004
Location: Aurora, CO
Posts: 1,283
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: sanding through glass


Quote:
ORIGINAL: dbsonic

...The concern is the fraying that might occur and how to hide???
Hit it with some CA. It's what I do and it works fine. Then sand some more with some high grit.

Kurt
Bozarth is offline  
Reply With Quote
Old 10-31-2012, 09:53 PM
  #8
dbsonic
Thread Starter
 
dbsonic's Avatar
 
Join Date: Oct 2005
Location: san jose, CA
Posts: 789
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: sanding through glass

SBSS. Long ago, yes. Still have some projects that need wings. Big scale jobbers. I wonder if anybody in SBSS would want to buy the fuselages.

Anyways, it seems to have worked out okay. Had to be careful not to sand down too far. But with good saturation of all the glass layers it seems to have wet sanded down alright and no fraying. Little bit of touch-up and now a coating of primer.
dbsonic is offline  
Reply With Quote
Old 10-31-2012, 09:54 PM
  #9
dbsonic
Thread Starter
 
dbsonic's Avatar
 
Join Date: Oct 2005
Location: san jose, CA
Posts: 789
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: sanding through glass

Thanks everyone for the input. Normally you dont want to sand into the glass but interesting to know it can be done intentionally.
dbsonic is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 05:46 AM.