for small amounts of wood, say riser size- melt some cheap candle wax in a double boiler, and dip the ends in it- it is y far the best, you can paint with a oil based paint, i buy sealing parrafin wax by the 50# block-same as candle wax- just a lower melting point.
can also use good ol' white carpenters glue. just get a good airtight coating.
cut it a bit wider and thicker, for shrinkage- but a good bit longer for the checking. cut lengths as long as possible- so you dont waste too many 6" extra pieces. then when its dry, buck it to the correct lengths. with the ends sealed, the moisture will be escaping out the sides, so length wont be effecting the drying process.
sticker your pieces for drying, and i like to put a flat ,solid weight on top to help stop warping/twisting- say a large flat piece of scrap steel- that is also stickered between it and the wood- to allow air flow.
i am in the process of building a drying kiln- very simple to build, an insulated box, with a de-humidifier -piped to the outside- to remove moisture.
mine will be quite a bit bigger- room size- but just a frame with some well sealed builders plastic, inside your garage will work very well.
bolt it together, so it can be taken apart, and stored. wrap the plasic around. and seal with tuck tape or such. with the de humidifier on the one end
wood stickered inside, on a plywood base.
seal all the framing wood well, so it doesnt get sucked dry too.