How to pre-prime cedar shakes?

Hi, This is my first post, I am looking for advice on how best to pre-prime shakes. A contractor said the only way he would do it is to prime both sides of the shakes. But then another contractor told me that if he did that, then he should also prime the edges of the shakes. In the old days, they used to dip the shakes in primer, so all sides and edges were covered. Basically my question is, what is the point of priming the back side of the shakes, but not the edges?


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