Terry,
I don't know where the tear/spit is, but if it is any where that will be stressed when you sit/ride (not implying you are over weight at all
) I have had no luck with the "Vinyl repair kits." Some have I guess. I found the best thing is to get an upholsterer to close the split and reinforce it from behind with a swatch of material, then use the vinyl repair kit to repair the "blemish" if it shows.
G'Day Bob, well the seat that Tom is sending me is ok, just a couple of small holes in the side that look a bit like cigarette burns, so I'm confidant that the repair kit I bought should fix that ok.
I've got a K2 seat with a split down the middle if the cover, along the pressed "seam", so I thought that I could carefully take the cover off, and use something like Offy's Shoe-goo on a piece of materiel of some sort, then when dry put it back on.
I could then use the repair kit to hide the repair like you suggest, and even give it a coat of vinyl paint, as the seat looks a little "faded" too? Doesn't matter if I bugger it up, I bought this seat on Ebay for 5 bucks from a wrecking yard, and they wanted 90 to ship from the US, so I paid them the 5 bucks and said "keep it", and 3 months later, it arrived in the mail? Lucky me! Cheers, Terry.