Using a Hot Glue Gun to Fill Wood
In a couple of my latest videos I showed a little snippet of filling voids with a hot glue gun. And, while I was quick to gloss over it, many viewers asked what in the heck I was doing with a hot glue gun on the fancy wood. The short answer is filling voids, mostly from knots, but also from cracks and any other imperfections which show up naturally while processing solid wood.
We started using the system (we purchased it from Rangate) about a year ago, and it has won us over in the shop for its speed, while producing great results. It has been taking over for epoxy in more and more situations as we gain more confidence in its ability to perform.
The knot filler sticks are basically hot glue sticks and we call them hot glue sticks. However, they are definitely different. I can tell you from experience that actual hot glue sticks aren’t sandable like the knot filler sticks made to fill wood. I attribute it to a lower melting temperature of the hot glue sticks, which almost immediately gum up sandpaper and just get pushed around on the surface like old chewing gum. YOU HAVE TO USE KNOT FILLER STICKS.
We have been using the sticks purchased from Knottec because they are more reasonably priced than the options from Rangate and seem to work equally well. Overall, I feel like the Rangate system is overpriced based on the fact that in the end it is really just a 300 watt hot glue gun and a couple of simple accessories, which are available for much less money than we paid.
The knot filler sticks are available in several different colors, but we mostly use black. It seems to look the best in almost all occasions. Only on white woods, like maple, do we deviate from the black, but there are many times even in those white woods, where the black looks great. If you only get one color, get black.
Overall, using the hot glue gun is super simple. Just squirt some in the defect, squish it in with an aluminum block (which also quickly cools the glue), and then cut off the extra. Click the video below to see just how quick and easy it is.