Bondic is a unique "tool" that has its own special place on your workbench. If you have had any dental work done in the past, chances are you have had experience with this concept.
Basically, a crystal clear resin the consistency of thick super glue is applied to the joining surfaces of two objects. This 'resin' can be manipulated with a toothpick or similar probe and, when done, a light is used to activate the resin and cause it to harden in a matter of seconds.
While the resin has similar properties to super glue it is not a replacement. The surfaces to be bonded need to be roughened to give the resin a "tooth" to adhere to. Here Walter is going to use Bondic to thicken the roof of this cab. While we have found that Bondic does adhere to some materials (like some plastics) most of them, including the soft metal, need to be roughened for it to bond.
We applied the resin from the dispenser and used the applicator to spread it around on the surface. Multiple, thin layers seem to work best, and since the resin is crystal clear, the LED has no problem passing through hardened layers to cauterize the liquid if necessary. Excess resin can be wiped off with a towel.
Once you are satisfied with the way the resin has been applied simply shine the LED for a few seconds - literally 5 or 6 seconds.
The resin is immediately ready for sanding, drilling or polishing.
Once cured, it has the hardiness of cured CA super glue - very receptive to tooling. Bondic will work to fill gaps and attach parts but remember two things:
1. The surface should be roughened with heavy grit sandpaper or scraping (as shown) and 2. In order for the resin to cure, it must be exposed to the light from the LED - it will not harden in an enclosed detail.
A great tool for many of your model railroading projects - Bond, build, fix and fill - Cures in seconds - Can be painted - Works on metal, wood, ceramics, glass, plastics, and more!