I use only Alpha sealant on mine. While I think the Dicor would actually work fine the Alpha matches perfectly with the existing sealant. Trying to keep it as stock looking as possible up there.
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2014 Redwood 38BR, Fulltiming
2013 Ford F-350 CCSB 6.7L 4x4 SRW, B&W Companion Hitch, Air Bags