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Similar posts prior, but here's mine: I live in Coastal CT, and have hot water radiator heat. Mid-1800's house. I like to use FJP pine trim (1x4 thru 1x10) because it's pre-primed, and tends to be straight / true. I would only use this product on the interior (see other posts re: FJP on exterior). Here's my deal: I'm experiencing some substantial shrinkage. Maybe it's due to the high humidity in the Summer (we have no A/C), but it's mid-January now, and EVERY ONE of my caulk joints (baseboard, casing, whatever) is opening up. Season to season as well. Not just the work I've done recently. I'm beginning to think I need to pre-prime all end cuts even on the interior work. This must be the softest/ youngest wood in the yard, and bottom line: it's a sponge. I'm talking 1/4" shrinkage or more on a 1x5 door casing. Massive.
Any thoughts/ experience welcome. Again, this is an INTERIOR situation. Thanks!