On all bar one of the cars I have owned I have had a spare wheel, even if just a space saver. The exception was my FIAT 126 with Dunlop Denovo wheels and tyres. Replaced them with standard wheels and tyres.
If I had a car without some sort of spare I would get a wheel from a scrappies, even if it meant giving up boot space to carry it. Tyres and rims are regularly damaged beyond repair with a can of spray. Plus, once you use the spray the tyre is normally unable to be repaired.
By Honest John9:30AM GMT 11 Nov 2014
How useful are the spray cans intended to make temporary repairs to flat tyres? My pregnant daughter pulled over to find a long screw protruding from a deflating tyre. The patrolman who attended said she had two choices: put on the spacesaver spare and go straight to a tyre place, or use the spray and have up to 500 miles of use before getting a permanent repair. She opted for the spray, but later wished she hadn't. The tyre company, a local independent that we've used and trusted for many years, told her that a proper repair was not possible following the use of the spray, so she had to buy a new tyre.
AT, Shepperton
I'm not a fan of these spray sealants, not least because they destroy the tyre and you have to replace it.