Are you talking about the sealers in a spray paint bottle?i would just be careful with extreme bends on the leg and you will be ok. you defiantly do not want to stress it. the inner leg has a connecting bar that loops around where the leg is screwed together. its normally the plastic around the screw that cracks causing the leg to be looser then it should....
its hard to explain without pictures
if you can find future floor polish your set. it is an acrylic sealer its fine for fixing loose joints and completely removable with a little Windex...it will only run you 6 bucks at walmart. ive been using it for loose joints for a few years always does the trick.
i would try this before doing a permanent setting sealer solution.
Do after taking off the feet, just apply a thin layer on the ball join correct?