Not sure exactly when they swapped from the Alpha to the Dicor roof, but somewhere in the 2014 / 2015 models they went to a Dicor Diflex II, which is a TPO. Mine was manufacturered October 2015 and has the Dicor roof. If dicor, lap sealant will be Dicor 501. No need to do much to the roof other than clean it, how often depends on how you use it and how it's stored. Really no need for a protectant.
John and Rebecca Dickson
Emma-8 / Little John-5 / Iva-1+
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)