Petrolatum is great at reducing TEWL, but are there occlusive plant derived raws (e.g. hydrogenated waxes) or silicones (e.g. high CPS dimethicone) that can beat it at TEWL reduction without clogging pores / causing breakouts? (yes, comodogenicity is a controversial measure).
Personally I use petrolatum from time to time, I don't have anything against it, but if you could make something a bit thinner and less shiny, that reduces TEWL for longer, you could have a great moisturizer base on your hands.