Trälim

Trälim is the Swedish term for wood glue, a class of adhesives used to join wood pieces. It encompasses several formulations, with the most common being PVA glue, a water-based adhesive that dries clear, sands well, and comes in interior and exterior grades.

PVA glues are the workhorse of woodworking. Exterior-grade PVAs offer moisture resistance but are not waterproof. Other wood-specific glues include polyurethane (PUR), epoxy, hide glue, and casein glue, each with distinct performance traits. PUR bonds strongly and resists moisture but tends to foam during curing and can be difficult to clean. Epoxy is a two-part system that fills gaps well and adheres to a variety of materials, including metal and stone, in addition to wood. Hide glue and casein glue are traditional options; hide glue is reversible with heat and moisture, which is valued in restoration and antique work.

Curing and clamping are essential for strong joints. Joints should be clean, dry, and free of finishes that inhibit bonding. Clamping ensures even pressure during cure. Typical initial set for PVA occurs within 20–60 minutes, with full strength after about 24 hours; PUR cure times depend on moisture and temperature and may extend longer in dry conditions.

Finish compatibility varies by formulation. Some PVAs take stains and paint well, while others may show adhesive lines on light woods. It is important to follow the manufacturer's guidance for staining or finishing over the glue line.

Storage and safety: keep containers sealed and stored cool and dry. Most wood glues are low-toxicity, but epoxy and PUR systems require ventilation and protective handling; always follow safety instructions.

Overall, trälim remains the standard adhesive in woodworking in Sweden, with the choice of formulation guided by environment, bond strength requirements, and material compatibility.