A friend of mine uses his home processed bio-diesil as a solvent for this purpose.
For tar and oil, nothing beats olive oil with a little sand mixed in.
Dale Hodgins wrote:The flour seems to have gone off a bit, but the product still works well and it still smells like coffee.
The next batch will be half as big.
Dale Hodgins wrote:That sounds like it could work. There are also spices that prevent things from growing. Cloves might be a good choice.