Why not get a wax?
You don't a wax? Or don't know why.lol
Wrong impression then it's the other way round generally.
Waxes take longer to apply yes.
Sealants do last longer than waxes in most cases though.
Don't get bodywrap mate it's a little fussy and imo needs a little detailing experience to get right.
Anyway you're going to need something a little better than blitz for the winter.
Similar idea to blitz.. Will last twice as long...
http://www.polishedbliss.co.uk/acatalog/werkstat-acrylic-jett-trigger-cat12.html
Its not so baddd!!!
C1 is leagues ahead though. As you said.
Problem with BW is when its on soft paint, like the Clio, it wont bead v well.