mostly you can just put the self leveling lap sealant right over the top of what's there. just clean with mild soap and water and seal. the new lap sealant will fill in the cracks and voids and give you a great seal without removing the old, unless the old sealant is pealing up, then just remove what's loose and seal as above.
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Jason & Wendy
2014 Ford F-350 Lariat 6.7L PSD
2015 Keystone Montana 3711FL
B&W Patriot 16K Fifth Wheel Hitch
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