Vinyl top installation .....

1. have plenty of 3m glue.
2. make sure you have even coverage of glue.
3. Spray roof and vinyl and allow a few min to tack.
4. Use a rolling pin to roll out.
5. get a few friends and make sure they pull vinyl tight.

As far as that seam, I'd use All metal.

I like using Stoner's Trim Shine (stoner.com), it's an aerosol spray, but when it drys it's an awesome shine.