A good stain or seal job on a wood deck is 20% application and 80% prep. If you skip or rush the prep, the best stain in the world will peel inside a year. If you do the prep right, a mid-grade stain can last three to five years on a Grand Strand deck — which is remarkable given our humidity and UV exposure.
The first thing we look for when we walk onto a deck is the condition of the existing finish. If it's flaking, cracking, or peeling, that old layer has to come off before anything new goes on. A proper pressure-wash at the right PSI — usually 1,500 to 2,200 for softwoods like pine, and up to 2,800 for hardwoods like ipe or mahogany — will remove most failing finishes without gouging the grain. Higher pressure than that and you're fuzzing the wood, which telegraphs through the next stain coat.
The second thing we assess is biological growth. Any deck that's been in the Myrtle Beach climate for more than two years has some level of mildew, algae, or tannin darkening in the wood. Pressure alone won't kill that — you need chemistry. We apply a wood-safe sodium percarbonate solution (the same active ingredient as OxiClean, but formulated for wood) that lifts the organics out of the grain without damaging the lignin.
The third — and most often skipped — step is the brightener. After you've washed and cleaned a deck, the pH is alkaline and the wood looks slightly gray or muted. A brightener (usually oxalic acid–based) neutralizes the pH, opens the grain for stain absorption, and restores the natural wood color. It's a 15-minute application that most DIY cleanings skip entirely, and it's the single biggest factor in whether your stain looks rich or muddy when it dries.
After the brightener, you wait. Wood needs to reach 15% moisture content or lower before it will accept stain properly, which in our climate usually means two to four dry days. If you stain wet wood, the stain will sit on top and peel off in sheets within a year. Check with a cheap pin moisture meter before you open the stain can — it's a $20 tool that saves a $500 job.
If you're planning to stain your deck this season and want the prep done right, TruShine offers full three-stage deck restoration: wash, brighten, and prep. We don't apply stain ourselves, but we hand your deck off to your painter or to you in perfect condition for the finish coat. Call (843) 279-2509 and we'll quote it.