To do this we recommend just putting some solvent (acetone, mineral spirits, paint thinner, etc.) into one of the bottles and spraying a bit through the gun. Some people just put water and dish washing liquid into the bottle, and spray it through. They say that it works fine.
Woolwax offers a lot of different undercoating spray applicators, and we realize that it can be confusing. Please see the link below for our Undercoating Spray Applicator Guide
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