I put a d-section seal on the slider itself. This one from ebay: Sponge EPDM D Section 19mm X 13mm Rubber Air Seal Door Strip Self Adhesive p/m | eBay
Attachment 122889Attachment 122890
Documented in this thread: New deluxe GOE sliders
It is working well although it does collect a very small amount of debris - think dust, small granules of sand - on the top edge.
David

