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Walt, yes, If the wood is seasoned any warping that was going to occur has. I would however retreat with a semi transparent stain. People often wonder why their decks with Ptl start to split and twist and look old, the preservitive wears off form the the outside inward.If your ties start to look really weathered Gray and not green it might be a good time to retreat. Semi transparents stain wears instead of building up. Maybe before the seasonal reballasting of ther track take a pump up garden sprayer filled with stain and spray the ties, then wipe off the rails with rags and then reballast. Hope this helps. Another note PTL manufactured after the first of this year does not contain the arsenic the older stuff did, you can tell the difference by slight blue streaks mixed in with the green color. Some off the older stuff may be found until it is all sold. It's more health and EPA freindly.
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