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I'm with Shane. Beth

Remember, an educated customer is a happy customer, so I'd bring them in on the conversation. Explain the 2 schools of thought on sealing new wood. Lay out the pros and cons, and what their expectations and expenses should be either way, then let them make an educated decision. (You took the time to learn about it, you deserve to show off!) If they/you decide to seal now, Thompson's isn't my flavor, but it's a fine product for this situation. Remove the mill glaze just like any other waxy sealer. I like to use clear sealers for fresh wood, partly because if (or when) it fails in a few months it won't be so noticeable, and partly so the customer can enjoy that look of new wood for a while. Nothing you put on is likely to last more than a year. Come back next summer after it's aged and dried and seal it up right. If that's done well they'll get at least 2 years out of it.