Prime Backside Of Siding ?

Hello:
a. Regarding the typical Wood horizontal type of Clapboard siding:
Is it desireable to prime the backside of the planks ? Why ?
My thought being that it "might" be better to have it un-primed to allow moisture to escape , but am not sure, hence the question.
b. The same question, for T1-11 wood panel type of siding.
If the answer to either is "yes" to either, is it actually available this way ? From which mfg(s), please ?
Thanks, Bob
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Backpriming wood has always been the normal professional way of working the material.
The purpose is to prevent moisture entering the wood. Moisture will exit to the exterior and push off any paint or coating that is there.
There are more manufacturers offering preprimed product than in the past. Enter preprimed wood siding in Google.
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Robert11 wrote:

There are a couple of reasons to paint all surfaces of wood. The end grain is particularly important since it sucks up water faster than other surfaces. TB
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