What is the recommended sealant for the surrounds?
Most 4x woofers do not need much, if any, re-sealant because most 4x cabinets are not meant to be airtight.
This is the only stuff that won't change the woofer's response:
http://www.ebay.com/itm/ACOUSTIC-RE...630?pt=LH_DefaultDomain_0&hash=item2c6d9913be
It is usually listed in "Vintage AR's" Ebay store as well.
Roy