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Polyester resin is a popular choice for coating and reinforcing timber, but does it work on any type of wood? Understanding this helps you achieve strong, long-lasting results whether you’re repairing, waterproofing, or fabricating.
Which Woods Work Best With Polyester Resin?
Polyester resin generally gives the most reliable results on dry, clean hardwoods or marine-grade plywood. These timbers provide stable, non-oily surfaces that allow the resin to bond effectively. Avoid freshly sawn or damp timber, as any moisture can interfere with proper curing and adhesion.
Considerations For Oily or Exotic Timbers
Certain woods, such as teak, iroko, or other exotic hardwoods, contain natural oils or resins that can make direct bonding difficult. To ensure good adhesion, surfaces should be thoroughly degreased and sanded just before coating. In some cases, applying a suitable primer or cleaning with a solvent (as directed by the resin supplier) can help further improve the bond.
Preparing Your Wood for Best Results
Regardless of wood type, start with a surface that is clean, dry, dust-free, and slightly roughened. Sanding opens up the grain and helps the polyester resin soak in for mechanical grip. For critical repairs or structural work, consider using a dedicated Resin Fibreglass Repair Kit for a complete solution, as these are tailored for optimal adhesion to timber and other solid materials.
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While polyester resin offers strong, waterproof coatings on many woods, taking care to choose the right timber and preparing it properly is essential. For deeper detail on working with resins, see our main guide on how to coat wood with polyester resin.