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Short Summary
Main recommendation: Use wood glue with careful technique, including sizing end grain, managing temperature and drying time, and clamping evenly to prevent slipping, while using homemade wood filler from sanding dust mixed with glue to fill gaps. The video presents these as five practical glue-up tips for woodworkers, including a note that Tight Bond is not a sponsor despite his frequent references to it.
Key Points
- The five tips for better glue-ups, as presented: (1) make your own wood filler from sanding dust and glue, (2) size end grain before gluing, (3) account for temperature and humidity, (4) understand glue cure time, and (5) prevent boards from slipping during clamping.
- Wood glue alone is least effective on end grain, which absorbs glue heavily and can starve the joint, so sizing is recommended there.
- Glue thickens in cold conditions and can produce a weaker or slower-drying joint, so temperature matters more than humidity.
- Glue can often be unclamped in about 30 to 60 minutes under ideal conditions, though full cure before applying stress takes about 24 hours, a guideline he says may be a bit excessive.
- Salt and brads were discussed as slip-prevention methods; the speaker found salt ineffective and considered brads a hassle.
Details Worth Noting
- Concrete instructions: To make wood filler, sand the project with a sander that has dust collection, collect the sanding dust, mix it with glue to a putty consistency, and spread it into gaps with a putty knife.
- Concrete instructions: For sizing end grain, either (a) apply glue directly to the end grain and pack it in with your finger, let sit a few minutes, then glue normally; (b) thin wood glue half-and-half with water, brush onto end grain, wait 15 minutes, then glue normally; or (c) apply a coat of full-strength glue and let it dry about 15 minutes.
- Concrete instructions: To prevent slipping, spread glue thinly and evenly on one surface only, press the boards together and slide them until they grab, align them, wait a couple of minutes, then apply clamps a little at a time, evenly across all clamps, never full pressure on just one.
- Concrete instructions: Consider making laminations slightly oversized, then cutting and squaring them after the glue dries.
- Concrete instructions: Keep glue above 55°F for Tight Bond II and above 47°F for Tight Bond III (per Franklin International, as cited); he jokes that working in a freezing shop like Minnesota wouldn't be comfortable anyway, so consider a heater. Glue that freezes can be thawed and reused, as Tight Bond says it tolerates five freeze-thaw cycles before losing effectiveness.
- The speaker notes Tight Bond's website says thinning its glue more than 5% reduces bond strength, though sizing is not meant to bond the wood. He suggests a side-by-side test of the three sizing methods has not been done, and believes any sizing beats gluing end grain untreated.
- Not all joints need maximum strength; small decorative projects like jewelry boxes or picture frames may be strong enough with end-grain gluing once sized, as he notes some projects can even be overbuilt.
Bottom Line
Good glue-ups depend more on technique and conditions than on the glue alone: size end grain, keep the shop warm, clamp evenly, and allow about 24 hours of cure before putting stress on the joint.
