Get it? ... Covered? ... because it's paint... and... nevermind...

Source
From the post:
Basing Alchemy: NEXT?
Following 'Season 1.3 - Basing Alchemy 1: Earth', a miniature painting and modelling DVD focusing on how to create beautiful Earth-themed gaming and show-case bases, Painting Buddha is now working on the next Element.
This time the miniature painting community gets to decide what element of the Basing Alchemy will be covered next: Water, Fire or Air.
On their website, Painting Buddha has launched a community poll to decide.
The new DVD set will be released later this year.