I have never seen a trailer with the ceiling ribs covered, it really finishes it off nicely. Better get on the sealing or you never will, prepping takes longer every day you use it. If you don't get the prep right it wont last. I had mine done at the dealer before I picked it up so I was not tempted to use it before it was done. Great decision, the floor has held up great 3 years now and still looks good.