You could also seal with a non-waterbased cream...low porosity tends to not absorb oil resulting in a greasyish look but some people can make it work.
I personally use Komaza Califia Moisturizing Cream (any cream/butter without water will act as a sealant though) and I love it...I don't use any sort of pure oil though, synthetic or natural.
Last relaxer: April 2, 2012 ... I'm Transitioning!
▪ Wiry texture ▪ SO pattern ▪ Sharpy-sized & pen-sized curls
▪ Coarse strands ▪ Normal porosity ▪ Normal elasticity ▪ High density
▪ Rhassoul clay
▪ Jane Carter Solutions Nutrient Replenishing Conditioner
▪ Komaza Care Califia Moisturizing Cream
▪ Yes to Carrots Shampoo