Frank, Vantec is not a "roof paint" or any other sort of paint/sealer for that matter.
It is a product that is sprayed on the exterior of the van to provide a 'protective surface" to reduce the effect of weather etc on the van's appearance. It is not a "sealer" as such.
I have it on mine (from new) an excellent product, but I very much doubt that spraying the roof of a vanthat is not brand new to seal it would be a waste of money.
Cheers - John
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2006 Discovery 3 TDV6 SE Auto - 2008 23ft Golden Eagle Hunter Some people feel the rain - the others just get wet - Bob Dylan
friends painted their roof with ceramaflex - they say it reduced the summer temp by 10 degrees - have purchased some to do ours but its too wet and cold here in Vic to do it now so will wait till later in the year in QLD
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Jenny and Barry
2009 Roma Elegance / 2013 Colorado. Permanent travellers 2011-2015 now just travel for 4-6 mths