When using a semi-transparent DEFY stain (Essential, Extreme or Ultra), only apply as much stain as the wood can absorb easily. If any puddles form during your staining process, be sure to brush them out to disperse the puddle.
DEFY Essential and Extreme stains have a flat finish, so if a gloss has formed on the surface the stain has been over-applied. Over time, it will be likely to peel. Even after two coats, your deck should still have a flat finish.
With DEFY Ultra stains, two coats will result in a satin finish. One coat will appear flat. A glossy appearance, would still indicate an over-application.