People think of a convertible top as fabric. In practice the rear window is very often the part that fails first, and on a lot of cars it is the reason the whole top gets replaced.
The two options
| Plastic curtain | Heated glass | |
|---|---|---|
| Clarity over time | Clouds and yellows with UV exposure | Stays clear indefinitely |
| Folding | Creases, and cracks along the fold line — the usual failure | Does not fold; the top is designed around it |
| Cold weather | Becomes brittle; folding it cold is how most of them split | Unaffected |
| Defrosting | None | Heated element clears it |
| Weight and stack height | Lighter, folds flatter | Heavier, needs the right frame and well |
| Cost | Lower | Higher |
Why the window usually goes first
A plastic curtain is a sheet of flexible vinyl stitched into the fabric. Every time the top drops, it folds. Every fold works the same crease. Add Carolina summers clouding it from above and the occasional cold morning making it brittle, and the outcome is predictable: it hazes, then it cracks at the fold, then water gets in.
By the time water is getting in, the fabric around the window is often still perfectly serviceable — which is exactly why it is worth asking whether you need a whole new top at all.
Can you replace just the window?
Frequently, yes. If the fabric is sound, the seams are intact and only the curtain has failed, replacing the window alone is a real option and costs considerably less than a full top.
It stops being an option when the surrounding fabric has gone stiff and chalky, because new stitching through tired material tends to tear out, or when the seams either side of the window are already opening.
Can you switch from plastic to glass?
Sometimes, and it depends on the car. Glass is heavier and does not fold, so the frame, the well and the way the top stacks all have to accommodate it. On cars that were offered both ways from the factory it is usually straightforward. On cars that never were, it may not be possible at all.
This is a question to ask with the car in front of us rather than over the phone.
Making a plastic window last
- Never fold the top in cold weather if you can avoid it
- Never clean it with anything containing ammonia — glass cleaner clouds plastic
- Use a plastic-specific polish, not a glass one
- Never put the top away damp
Bring the car to the shop in Monroe and we will tell you honestly whether you are looking at a window, a repair, or a new top. See our convertible top replacement page.