pressure treated wood.
It depends on what type of pressure treatment you have and how long it has been since the wood was treated. Some types of pressure treatment used in outdoor furniture can, supposedly, be primed/painted or stained immediately. Typical pressure treatment needs six months or more to absorb into the wood and for the solvents to evaporate before you can apply a finish.
Whether you use paint or stain is up to you. You need a primer if using paint and I would use an alkyd like Benjamin Moore Fresh Start. If using a solid color stain, I would go with something like Sherwin Williams Woodscapes acrylic (water based)---it requires no primer. If staining with a semi-transparent use something like Cabot's or Sikkens products.
If you prep and prime, and contrary to prior post, paint will last as long as stain. Whatever you use, plan on applying finish every 2-3 years. If you race and apply anything to pressure treatment that is not yet ready you are in for trouble.
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