I need to reseal the rubber surrounds on a pair of Radio Shack Mach 1 speakers. I have some leftover "white glue" from a previous foam surround replacements but have read that for rubber surrounds "Seal Cement" sold by Madisound is better. This is a contact cement that is used for repairing wet suits, rubber boots etc. Does 'white glue" work on rubber surround or should I get the $15(plus shipping) Seal Cement?