About Finish all

Hello Dear, i watched your video yesterday ,unfortunately not life!
However i would like to patch my futon which supposedly should be leather which i believe is vinyl like the one you showed your demo on. My question is,if i use the Leak Seal and the Finish all on top would that be usable again,I mean we are using the futon and i am afraid it would crack?!
Please advise !
Thank you so much!
Ester