Does anyone make a replacement channel? Or if it is perforated, can it be repaired using fiberglass mat and POR 15?

Restoration Design sells it. Maybe 914rubber.

Just saw the metal on 914Rubber… we need some for a new project

THIS IS THE 914 PO-PO!
Step away from the fiberglass sir!

Just finished my rain channel repair today and used 914rubbers channel. It's spot on and is the correct metric thickness. Each order contains two pieces. One wide and one narrow. Together they form the channel.

Fiberglass? Don't be THAT guy.

And after your project Bob, if anyone should know, it's you!

Metal is 48" long so you may need more than one set, but it works well.
Cary asked us to make these right so we did. Relatively inexpensive and looks OEM.
Thay are here

https://914rubber.com/front-trunk-metal-for-porsche-914

Thanks for the replies!