There is a huge thread about this somewhere. Basic answer is that newly bought cans might work, ones that have sat in a pannier for months won't.
Gloop or ultra seal is better but still limited.
To be truly self sufficient you need to make sure you have proper tube type tyres, not TL plus tube, get the bead lubed before your trip and practice with the tyre levers. Get the prep and practice and you can swap a tube in ten minutes with a pair of 8-inch levers and then be set for the next thousand miles. TT can be better than TL but only if you fix manufacturer bodges like not using lube and practice.
Andy
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