We have used velcro on the top and bottom of the FP bimini. It is used to attach a piece of rigging
leather over the rear/port corner of the bimini. It protects the bimini against chafe from the main sheets
. This works well, so I guess you can sew blue or black velcro to the top of the bimini to attach a sunshade. Advantage is that mounting can be fast. Disadvantage is that in strong winds it might detach.
We are already setting up the sewing machine
to make a sunshade on the port side of the bimini. We have purchased sunshade cloth, and we have also ordered and received a zipper to mount to the zipper of the bimini. I just checked: it fits perfectly.
It is a 1.90 meter blue block zipper from YKK from their marine
series. It took a long time to order it, but it was not too expensive, 18 euro.
The sunshade will have nylon hooks on the bottom side, to attach it to the guard rail. We also want to add straps to attach it to the deck
immediately outside the portside bimini support leg.
Exactly how we will make this (so that it fits nicely on the guard rail AND straight down) we'll find out when making it.
The zipper of course consists of two halves. Interesting is that you can use the other half on the starboard side.......
When we have finished, we'll post with pictures.