There are many different methods and patterns for blasting flat surface areas. Many of these process (including the Overlap Method pictured above) can result in over-blasting of a large percentage of the surface. This can lead to increased amounts of media used and an inconsistent surface finish (especially with softer surfaces such as log homes).
One alternative is the use a ‘50% Gap Method’ (see picture below). Basically this process involves blasting horizontal strips of the surface leaving about a 50% gap in between each strip. You can then go back over the gap areas resulting in more surface area blasted per unit time and less overlap.
Thank you to Pirate Brand for this blasting tip.