The ONLY time that I have "resealed" brake calipers is when they leak. Other than that I see no reason to reseal them!!
IF you keep fresh fluid in the system you should NEVER have to touch them. UNLESS they "dump" salt on the roads all of the time!

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator