Mark Mandell - Gone Round In New Jersey
Cabots made a primer specifically for cedar called "Problem Solver"
It blocks the oil that seeps from knots and sap pockets. I used gallons of the stuff when we first moved in. The entire house is cedar and in 30+ years, I have no black streaks or knots.
No weepy siding
Carpenter bees, well, no help from the Cabots