ivan wrote:2nd question: the zip is tearing away from the window, which is not a huge problem yet because the roof still covers it so no leaking, but what are my (cheap) options? I tried the stickiest tape without luck, so I'm thinking of hand sewing it while its still on the car...any other bright ideas?
Sticky tapes won't help you. There's too much tension on the fabric for tape to hold it.
It depends a bit on where the tear is. If it is somewhere where there is plenty of fabric on either side of the tear, you should be able to sew it. Use a heavy black cotton thread. It can help have a selection of needles, maybe some curved ones, depending on the location of the tear. Pay a visit to Spotlight.
However, if there is not enough fabric because the tear is close to the roof or another seam, or its a bit ragged, it can be really difficult to sew, and if you can manage it, the repair won't hold, because the tension when the window is zipped will pull your sewing through the fabric. This might happen along the high side of the window. After several unsuccessful attempts to repair such a tear in my top, I found the following solution effective.
Get some black fabric mending tape (a loose weave cloth tape - Spotlight) and some 5 minute araldite. Prepare the tear if necessary by putting a couple of stitches in to hold it in place. Cut two equal lengths of mending tape. These will be a bit long longer than the tear you want to repair. You're going to araldite them to each side of the top's fabric, sandwiching the tear between them. You'll wind up with a triple layer of fabric - tape:top:tape - soaked through with araldite, so that it cures in a continuous matrix through the fabric. Mix the araldite, paint it onto the top's fabric along the tear, soak a length of mending tape with araldite, and place it along the tear. Work quickly. Squish it a bit if necessary so the araldite wets through both sections of fabric. Hold it in place until the araldite has cured. Then, mix up a bit more araldite, soak the second length of tape, and apply it to the other side of the tear. If you do this immediately after the first step, the second step will glue into the partially cured araldite, and you've effectively made a fabric weld.
This is very strong. Its the only effective way I found to repair a tear in a fabric section that has to carry a lot of tension - all my attempts at just sewing pulled through. The finish is not as discrete as stitching, but its in black, inside, in the dark, and not anywhere you look, so I'm happy with it. It saved me from buying a new top.
Hope that helps,
cheers,
john