I was in the automotive trade (dealerships) for years, and the best thing for gluing any kind of rubber to metal was 3m weatherstrip adhesive.(the yellow stuff) And I still believe its the best today. Napa A (not cheap)
I agree with the quote above. I have used weather strip cement on 3 different motor homes with great success. Suggest that you clamp the strip with spring clothes pins until you get it done and can close the slide to clamp all.