Wow,
We have been making screen kits for years for vanagon
http://fanchers.com/223/Screen%20Replacement.htm
Even have a Video for it now. You could have purchased the "screen
kit " and sewn the zipper to it your self. We supply the adhesive but
will not bond well to synthetics.
The Zipper has been on my never ending List of products I want to
make But proper install is always a question. I have done a few
prototypes just not finished to liking yet, Should have down soon.
But my shop is extremely busy with Boat and RV season on us. Here is
a link to all the VW related items we make in case your wondering or
didn't know to save you some time and money in the long run.

http://fanchers.com/59/VW%20Stuff.htm

Good Luck
Jonce
www.fanchers.com

>Hi all.
>
>Still need to glue screen bottom to canvas and decide on zipper detail
>at bottom each side, but this should all work out ok.
>
>Pics:
>
>https://picasaweb.google.com/musomuso/1981WestyPoptopFrontScreenReplacement?authkey=Gv1sRgCLihkY-j3bjb0gE#
>
>Beige material would have been better IMO. This is the older style
>screen/window setup. Wanted to make screen removable, but AFAIK meant
>glueing it to canvas around flap. That material is old and might not
>hold up to zipper use.  (though in hindsight no curves would have made
>that part much easier)
>
>Challenges: keeping glue away from teeth, clamping zipper so teeth
>stayed a suitable distance away from existing material. Used cloths
>pegs and pins glueing bit by bit. The back board was essential.
>
>Not a pretty job, but it should hold up. No special tools required,
>though patience is.   ;)
>
>Had used this to patch tent: http://www.beaconadhesives.com/cgfab.html
>  but would have been $30 or more. Had Goop on hand. Seems to hold
>quite well:  http://tinyurl.com/3gv2qeu  though we'll see how sunlight
>affects it. (likely won't)
>
>Neil.
>
>--
>Neil Nicholson '81 VanaJetta 2.0 "Jaco"
>
>http://tubaneil.googlepages.com/
>
>http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines