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Where I used to work we sealed over the old. Where I work now we remove all the old sealant. IMO both are acceptable as long as the seam is sealed.
IMO its a matter of aesthetics, and I will admit that all new sealant looks better. We use a multi tool with a flat blade to cut off as much sealant as possible and then peel the remainder.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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