That stuff should be perfect for both jobs, I would think. If you want to order SEM products online, check out this web site: leather repair, vinyl repair, recoloring, interior repair products
Give them a call, they will help you.
Any upholstery shop should have Volara, or be able to get it, but you can order that online also: Gray Closed Cell Foam, Closed Cell, Foam, Black Closed Cell Foam, Gray Closed Cell Foam from Rochford Supply - Your Online Textile and Upholstery Superstore!
This is just one place.
Closed cell foam is very firm, and a really tight curve you may need to piece and then scuff it smooth before you glue down the vinyl to it.