Sarah,
There two usual ways of gluing down hardwoods. One method (and the one this site cautions against for the DIYer ) is a full trowel method. That is when the entire subfloor is covered with adhesive using a notched trowel. I do not recommend that method for you. The other method is promoted by Carlisle Restorations, a well-known manufacturer of wide plank flooring. It entails using adhesive, PL400, in a cartridge, similar to using a caulking gun. The idea is you flip the board upside down, run verticle 1/4" beads of adhesive across the backside of the plank every 8", then flip the board over and nail it down using a flooring nailer. Very clean and secure. Plus, the PL400 adhesive can be easily cleaned up with mineral spirits as it is not a urethane adhesive but a different type of solvent adhesive. I used this method to secure 5000 ft of Carlisle plank flooring a few years back. It worked very well. But if you would rather drill holes in your floors, screw them down then plug those holes, have at it. I am not found of face nailing wide planks either. Looks amateurish to me.
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