Soft Top Windows @Amelia Brooker
The window in the picture is not glued. These windows are welded in a high frequency melting process. Seamless glued windows are very rare (at least with the European manufacturers). The Audi 80 and the Fiat Punto had such windows with the distribution. There was a kind of hot glue under in the window frame in which a copper wire was built in. You had to connect 12V to the copper wire to melt the glue for the installation and removal. For the installation one needed an original inner and outer frame to melt the new (mostly cursed expensive) windows in exactly the same way again. But even with the original frames, it didn't work with at least one of 5 windows. Because the wire at the start and at the end was hotter than in the middle. Either the window wasn't glued in the middle or - in the worst case - the convertible top was burned at the start and at the end.
With the welded windows as you posted them I sew in the new windows. But since the top has to be dismantled, you have to analyse the situation and condition of the soft top beforehand and talk to the customer about his car.
Of course, it is important how long the customer wants to drive the car? But even more important is how do you estimate the condition of the entire top. Have seams already dissolved? Are rubber bands or assembly strips damaged? You must be able to dismantle and mount the top without damage. Every customer thinks his top is "still good"... You have to stand up for it afterwards. Replacing the window is not worthwhile if the top is broken after one year.
I do it mostly in such a way that I ask the customer how long the window has lasted. And if I am of the opinion that the convertible top will last this time again, then I sew in a new window.
Also you should look what a new top costs. If it only costs a few hundred dollars it doesn't make sense either. Because the customer already pays the assembly costs - and in addition the material and the time for the sewing in or smaller repairs (1.5-2.5h) come still in addition.
The sewing is done as follows:
First I make marks on windows and window frames (the 2cm welding track). Then I cut out the window pane. I put the old pane on the new window pane.
You can also fix it with double-sided adhesive tape. But the tape must be removable without residue. I cut the new window to size beforehand but left it slightly larger.
Then I fix the top on the new window and make sure that the lines match those on the old pane. Then I sew in the window again with a special piping for windows (used at BMW Z3 for example). The piping has the shape of a "J" in the lateral profile so you don't look into the cut edge of the canopy fabric anymore. You should place the attachment of the piping in the middle of the window at the top, so that water can run in at the edge.
I hope you understand the translation
:D
I try to post an pic of the piping tomorrow.