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Applying too much sealer to a deck might seem like extra protection, but it can cause more harm than good. Wood is a porous material with a limited capacity to absorb liquids. When you go overboard with sealer, the excess can't soak in and instead forms a film on the surface. This leftover layer is prone to peeling, cracking, and trapping moisture, ultimately defeating the purpose of sealing in the first place. 

Yes, you can and should paint or stain pressure-treated wood to help prevent the boards from cracking. However, you must wait for the wood to dry out completely before applying any finish. Freshly treated wood can take weeks or even months to dry; a common recommendation is to wait three to six months. To check if the wood is ready, perform a simple water test: drip some water onto the surface. If the water beads up, the wood is still too wet and needs more time to dry. If the wood absorbs the water, it is dry enough to be painted or stained. You can proceed with building your deck or fence while the wood is still wet, but you will need to wait to apply the paint or stain.

While the answer varies based on weather, 10 a.m. is a good time to start painting. The dew will have dried, meaning there’s no moisture on the house, and the temperature will likely be moderate and the sunlight less direct. Starting mid-morning should also give you enough daylight and pleasant weather to work on the job for several hours.

Beyond liquid rubber, homeowners can use sealants, stains, membranes, or tapes as waterproofing options. Oil-based or water-based sealants soak into the wood, creating a moisture-resistant barrier. Waterproofing stains—available in transparent, semi-transparent, and solid colors—add both protection and style to your deck. For heavy-duty waterproofing, deck membranes and waterproof tapes can be applied under the deck boards to direct water away from the structure below. Whatever method you choose, clean and prep the deck first to ensure the best, longest-lasting results.