The play systems come with a lifetime warranty against wood rot, insect damage, or structural failure. The lumber has been pre-stained and sealed at the factory, with a non-toxic water-based sealer giving the wood a beautiful red finish. We do recommend re-sealing your play structure as needed with Rainbow sealer, available at all Factory Direct Showrooms, to keep it looking new. With regular use and as the wood expands and contracts with the weather, some of the bolts may loosen. We suggest checking and tightening all nuts and bolts within 60 days of installation — also, every 4-6 months re-checking and tightening as needed. The systems' through-bolt construction allows you to tighten these bolts as often as necessary without risking the structural integrity of your play system. We also recommend cleaning tarps, slides, swings, ladder rungs, etc. as needed to help ensure the safe enjoyment of your play system for years to come.