I'm not sure about the sanding sealer thing...... what I do know is that there is a huge difference in humidity/moisture between Montana, and most places the woods come from, so that alone forces me to let any natural handle material acclimate for a long time (my rule of thumb is that natural material I have shipped in, sits/acclimates for at least a year before being used). For me, if I can tell that they've "wet" wood with anything, I tend to shy away from purchasing it. That doesn't mean you necessarily should too, but I've just had enough bad experiences that I tend to err on the side of caution. It's really heart breaking when I've purchased a really nice, big chunk of burl on the net, and by the time it gets here, and I unbox it, it's already full of checks and cracks..... and in one case, by the time it had acclimated, it was so riddled with checks and cracks that I literally got no usable handle material from it. That was a big lesson learned for me.