The soil suction solution is normal precisely because it works. If magic paint worked, magic paint would be normal. I did a good deal of research when I found that the radon fairy had visited my building. I don't even have a basement. I'm very wary of 24/7/365 electrical loads. Based on research, I have a fan.
If you look around for a good one, you can get a radon fan that runs on 17-18 watts (12.5 kWh/month, pretty much.) That will be effective (no telling if it will be effective enough for your particular case until you try it.) [You can also get much less efficient ones, so I recommend shopping carefully with that in mind.]
Merely sealing, by any means, is not generally considered to be effective without a fan, or at least a passive duct. It can make a fan work more effectively, but by itself, if you have a problem that rates remediation, it probably will not be effective. Maybe if you have 5 pCi/l (185 Bq/m3) and are trying to get below 4 (152.) If trying to get to 2.7 (100) or less you'll almost certainly need a fan. If starting much higher you'll pretty much definitely need a fan.
Silicate surface sealers (I'd go looking for one not purporting to be a radon product, as they are pretty much the same and I bet that one costs more) are intended for the "flat expanse" case - caulking is for cracks and gaps at the edges or penetrations. Neither product does the other job well, so if attempting to seal the floor you'll use both product types.