Yes — it's widely used to waterproof and encapsulate wood decks, deck boards, stairs, and framing. It rolls on and cures into a flexible, watertight rubber film that seals the wood against rain and moisture; one customer describes fully encapsulating their deck boards in an even color, and another built up 3 coats for a watertight roof deck. It's an especially good choice for exterior balconies and roof decks over living space, where a true waterproof membrane matters.

For full protection, coat every wood surface water can reach: the tops and edges of the boards, the sides, and ideally the undersides and framing. Reviewers coat the underside of boards and the joists and posts to stop damp and rot — one in humid Florida sealed under the boards specifically to protect the structure. Encapsulating the wood on all faces gives the longest life; at minimum, seal the walking surface and board edges thoroughly.

Yes — that flexibility is a key advantage on wood. It cures into an elastomeric membrane that stretches up to 1300% and bridges cracks up to 1/4", so it moves with the boards as they swell, shrink, and shift with weather instead of cracking like a rigid deck paint. Reviewers describe the cured film as tough, durable, and flexible, performing exactly as advertised on decks and balconies.

Apply a minimum of 2 coats for a standard deck and 3 coats for a roof deck or balcony over living space. Bare, rough, or thirsty wood soaks up more, so coverage often runs toward the lower end of the 100–250 sq ft per gallon range — a few reviewers note a rough deck used more than expected, so measure your area, plan for the coats, and buy extra. For a large deck, the 5-gallon pail is the economical choice.

A deck that's still tacky underfoot usually hasn't finished curing, or was coated too thick, in cool or humid weather, or before a previous coat set — a couple of reviewers on large decks hit this. Give it the full 5–10 day cure at moderate temperatures with good airflow, and always build up thin, fully-cured coats. For a smooth, non-tacky walking surface that's comfortable for bare feet, let it cure fully and consider a Titan Shield Gloss topcoat.

Yes — SEMCO Liquid Membrane bonds to plywood and wood sheathing and is a strong choice for exterior balconies and decks over occupied rooms, where a leak means interior damage. One reviewer waterproofed an exterior balcony over plywood with excellent adhesion and a flexible watertight result, and another sealed a flat roof-deck above living space. Reinforce seams and fastener lines with fabric and build up 3 coats for these critical over-living-space decks.

Yes — sealing framing, joists, and posts is a great way to protect the structure from ground moisture and rot. Reviewers coat the framing of low decks and the 4x4 posts set into the ground, giving them a couple of days to cure. It forms a tough rubber barrier that keeps damp and insects from destroying the wood, which is especially valuable in high-water-table areas.