Most shops that sell wax jackets also sell products for maintaining them, such as reproofing sprays, tins of wax dressing and sometimes wax bars. However, reproofing a wax jacket properly requires knowledge, technique and experience. The wax needs to be applied evenly, without leaving patches, making some areas too heavily waxed while others remain too dry, or allowing excess wax to soak through into the lining.
When using a reproofing spray, bear in mind that you are only applying a surface layer. It's rather like putting a plaster over a wound, you're covering the problem rather than treating it.
When using a tin of wax dressing, it is important to bring the wax to the correct temperature and apply it evenly. Again, good technique and experience make a considerable difference to the final result.
A wax bar doesn't necessarily make the job any easier. These are generally better suited to treating small areas or minor damage rather than reproofing an entire jacket.
Reproofing your wax jacket yourself or having it professionally treated? Discover the differences in our Knowledge Base.