Treated landscape timbers2/12/2024 The chemicals that manufacturers use to create pressure-treated wood protect the material from insects, and they work by repelling bugs as opposed to killing them. Chemicals that are used in pressure treating also control bugs. Related: The Dos and Don’ts of Deck Maintenance Also, as pressure-treated wood dries, it shrinks, causing the paint to wrinkle, crack, and flake.Ĭlear sealers and stains are more suitable for pressure-treated wood, although waiting for the wood to dry completely (which can take months) is an option. This makes for weak bonds and often results in the paint peeling or sloughing off. ![]() With the moisture in the pores of the wood, paint and opaque stains aren’t able to penetrate as they would with typical materials. Both of these factors make it tough to paint. Also, as the pores take on the chemical, the lumber will swell a bit in size. The amount of moisture that pressure-treated lumber can retain is truly remarkable. Painting pressure-treated wood is difficult because the paint cracks when the lumber shrinks.
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