I sanded and cleaned my wood deck boards with Behr semitransparent weather-proofing stain and sealer, one coat with a second coat in certain places. It is sticky after a month or so in certain places. The Behr people said it will dry eventually. But when?
The finish is a preservative that penetrates the wood and will not peel, and that is why a second coat should not be used. Maybe the sticky parts will eventually dry. Power-wash the sticky areas to speed up the process.