You need to get one without the ooze like seabond so I have heard the oozing occurs all day and it taste nasty/chalky.
I have both upper and lower dentures, this is the one that I use. I have tried Polident and a generic brand and I keep coming back to this one because it works the best, which isn't excellent but the best out of the options given. It does hold the uppers in for hours on end but aside from using screws to permanently mount my lowers nothing hold it for more than a few hours at a time.
I use to use the extra hold for my old dentures and worked a little too well but always left me feeling confident that I wouldn't loose the darn things in public...lol