Here is a goal: How to use a paint roller.

Which way makes more sense to accomplish this goal?

Available choices: a. Starting with top half of wall, dip roller approx halfway into sealer, run roller along grid until roller is saturated but not dripping, then roll paint onto the wall is nice even paths slightly overlapping the last one. Continue with this process for each wall.. b. Starting with top half of wall, dip roller approx halfway into paint, run roller along grid until roller is saturated but not dripping, then roll paint onto the wall is nice even paths slightly overlapping the last one. Continue with this process for each wall..
b.