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  #1  
Old 07-09-2018, 07:13 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
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Location: Dogwood Airpark (VA42)
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Default Canopy intersection fairing

Itís that time again - laying up the canopy fairings.

Years ago on the first 8A project I used electrical tape on the canopy as the release agent. That seemed to work well but now I read the warnings from Vanís not to use electrical tape as it can cause crazing.

The instructions call for Mylar tape or release agent. Iíd be interested in what builders are doing now and what they recommend.

Carl
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  #2  
Old 07-09-2018, 07:43 AM
sf3543 sf3543 is offline
 
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Default Things that have worked for me

I have used clear packing tape, Saran Wrap and the clingy static plastic used to wrap furniture when you move.
The packing tape works great but usually leaves a sticky residue you have to clean off later.
On aluminum, if the blue protective coating is still on, I will just lay up directly on that and put packing tape over any rivet lines or holes where it was removed. Works great.
A heavy coating of wax will also work, although I prefer the former methods.
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  #3  
Old 07-09-2018, 08:49 AM
rv8ch rv8ch is offline
 
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Quote:
Originally Posted by Carl Froehlich View Post
...Years ago on the first 8A project I used electrical tape on the canopy as the release agent. That seemed to work well but now I read the warnings from Vanís not to use electrical tape as it can cause crazing. ...
First I've heard of this - any idea why electrical tape can cause crazing? Something in the glue? Mylar packing tape comes from so many sources, I would struggle to ensure that it does not have the same glue as the electrical tape.
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  #4  
Old 07-09-2018, 08:59 AM
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Carl Froehlich Carl Froehlich is offline
 
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Quote:
Originally Posted by rv8ch View Post
First I've heard of this - any idea why electrical tape can cause crazing? Something in the glue? Mylar packing tape comes from so many sources, I would struggle to ensure that it does not have the same glue as the electrical tape.
This was posted on another thread - and that got me to wondering: https://www.vansaircraft.com/pdf/Acr...ndow_Hints.pdf

Carl
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  #5  
Old 07-09-2018, 10:25 AM
Lars Lars is offline
 
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If you use clear packing tape, be advised that they aren't all created equal. The adhesive on some will remain on the surface rather than releasing, and it can be incredibly difficult to remove. In my experience 3M works better than anything else I've tried. More expensive, but worth it for the savings in aggravation.
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  #6  
Old 07-09-2018, 12:35 PM
David Paule David Paule is offline
 
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The article that Carl linked to says not to use the tape on Lexan, but it doesn't say that for acrylic. I think that the canopies are acrylic.

Dave
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  #7  
Old 07-09-2018, 02:48 PM
Larco Larco is online now
 
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I have used electrical tape in layers while doing the fiberglass work necessary to finish several canopies. Started in 1995 and others as years went by. Whats up with not using electrical tape??
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  #8  
Old 07-09-2018, 03:34 PM
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Carl Froehlich Carl Froehlich is offline
 
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Quote:
Originally Posted by David Paule View Post
The article that Carl linked to says not to use the tape on Lexan, but it doesn't say that for acrylic. I think that the canopies are acrylic.

Dave
Yep - that could be my mistake.

Carl
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