Adhesives and Sealants — FAQ
What's the difference between construction adhesive and wood glue?
Construction adhesive bonds multiple materials with gap-filling properties and waterproofing, while wood glue creates a stronger wood-to-wood bond but can't handle gaps or moisture. For structural wood joints, use wood glue. For mixed materials or exterior projects, choose construction adhesive.
How long does construction adhesive take to dry?
Most polyurethane adhesives reach handling strength in 30 minutes and full cure in 24 hours. Latex formulas cure faster—often 4-6 hours—but continue strengthening over 24-48 hours. Temperature, humidity, and material porosity all affect cure time. Always follow manufacturer specifications.
Can I paint over construction adhesive?
Yes, once fully cured. Polyurethane adhesives can be painted, stained, or sanded after 24 hours. Latex adhesives accept paint more readily. Test a small area first—some formulas may bleed through light paint colors. Always clean excess adhesive before it cures for best results.
Is construction adhesive waterproof?
Polyurethane adhesives are 100% waterproof and suitable for continuous submersion. Latex-based adhesives are water-resistant but not waterproof—fine for occasional moisture but will degrade with constant water exposure. Check the label for specific waterproof ratings.
What surfaces can I use construction adhesive on?
Polyurethane adhesives bond wood, concrete, metal, stone, brick, ceramic, foam board, and most plastics. Latex adhesives work best on porous materials like wood, drywall, and concrete. Always clean surfaces of dust, oil, and loose particles for maximum adhesion.
How do I remove construction adhesive?
Uncured adhesive wipes up with mineral spirits or acetone. Cured polyurethane must be cut or sanded away—solvents won't soften it. Cured latex can sometimes be softened with heat gun and scraped. Prevention is key: tape off areas and clean tools immediately after use.