What's the scoop on Armorall http://www.armorall.com/?WT.srch=1 

A cracker or a good product? I was told by someone that the reason some say it causes cracking is because those same people didn't wipe it off right away, but a left it on thick to dry too much before wiping.  

Or maybe something like Zymol Seal http://www.zymol.com/zymolseal85oz.aspx is better?

I have all my rubber out for painting, so this is my once in a lifetime chance.