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Some lumber, like Douglas fir, will not readily accept the chemicals used in the pressure-treating process. However, if the wood is covered with small incisions, then the chemicals are readily absorbed. From a document on the subject -Not all pressure treated wood will have incisions. Why...

I saved the pic to my desktop and blew it up. It looks to me like the bottom split is following the knot line. I've seen this before. The top one looks the same but no knots. It looks to me like one of the fasteners holding your siding on came too close to the edge and popped that bottom one...

Thanks that's what I was looking for. I can clean it a thinner.

No it is a balanced formula of Phosphoric Acid, Dichromates, Wetting Agents and Extenders.

Crown cold galv coating 93% zinc

That's the thing, paint is not a problem. The cold galv is 93% zinc. I'll have to try it.

Having been a carpenter, both heavy construction and commercial, and a superintendent, I will say REPLACE IT. That post is not carrying any load the way it's cracked. I thought you were saying it was cracked length wise, this is broken in half. There is no good fix for that. Easier to replace...

I recently cleaned up my boat trailer and treated it with OSPHO which I have used before. I want to use Crown cold galvanizing coating. I called OSPHO and the tech I talked to said they had used a different type of rust changing material that was mostly tannic acid, I said OSPHO contains 45%...