If you want to make sure that the method you are using will stand the test of time, use the freezer test. The freezer test is a way to check if a substrate or underpainting method is suitable for encaustic art.
- Start with a sample project
- Add layers of encaustic medium on top of the substrate you want to test
- Properly fuse each layer of encaustic medium
- Allow it to cool completely.
- Place it in the freezer and leave it overnight
- Remove it from the freezer and allow it to get back to room temperature
- Drop it on a concrete floor with force, multiple times
- You may wish to repeat the freeze thaw cycle multiple times as well
- Inspect the painting —dented corners aside, if the encaustic has chipped away and separated from the underpainting or substrate then it isn’t compatible—if it held, then it is acceptable.