If it is that hard to seat the bead you've got issues. Wrong/bad rims, wrong/bad tires, wrong/bad technique. One tip: mount the tire w/ a tube first and fully seat the bead. Then deflate it and just pull off one side of the bead and slip or cut the tube out. That leaves you w/ one side already seated.
90% of the time a floor pump works.
However, I will contribute $10 to your recovery fund if you promise to use a can of WD-40 and record it!
I usually just use a compressor but without one I've used the "seat the bead with a tube" and the strap methods. I've never used the explosive method on anything but seen it done on a lot of truck tires. If it works on bike tires with sealant it would by far be the easiest method when there's no compressor around.
If im stuck without a compressor and floor pump wont do (Topeak Joe Blow mountain hi volume is kewl) I use a CO2 cannister. Just make sure you rotate the valve to the top as the CO2 can freeze the sealant.