303 is a water based protectant and Armorall is petroleum based. That explains it all... stay away from Armorall for latex.
Geezer is right about this 303 is basicly the same as Seal Saver the "gooeyness"(sp) can come from a couple of things first is using a petro based product will help "melt" the latex also just the latex touching latex will cause it to melt together.
So it is best to treat the seals at least once a month and move them around a couple of times a month. and if hanging them make sure the neck seal isn't touching the hanger, It would be good idea to go to a Scuba shop and get a wetsuit hanger for that as they are plastic.
This info comes from selling drysuits for 20 years. And my vendors.