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How to Use Overspray Masking Liquid

The Application and Uses of Overspray Masking Liquid

Difficulty: Moderate


What Does Overspray Masking Liquid Do?

Overspray Masking Liquid is a sprayable substance that helps protect hard to mask surfaces from overspray of primers, sealers, colour and clearcoats. It can be used on any metal, cured paint or tire in good condition. Masking liquid also traps any dust or dirt away from the working area.


Step 1: Preparing Your Surface

If you primed your surface before applying the masking liquid, you should make sure all the primer overspray has been removed prior to starting.


Use a damp microfibre cloth to remove any particles that may be on your surface. Then, use a drying towel to remove any excess moisture.


The masking liquid only protects against overspray and not direct spray, so you should use a masking paper for any areas that may be directly sprayed. This is especially useful if you want a straight edge.


You should make sure your surface is out of direct sunlight before applying.


Step 2: Using the Overspray Masking Liquid

You should use a 1.8-2.2mm spray gun at 30-40 psi spray pressure.


Holding the gun around 30cm above the surface, spray a light coat using a 50% spray pattern, making sure to cover the edge of the masking paper. Check for any missed spots and cover as needed.


Wait for 20-30 minutes for the overspray to dry. You'll be able to tell when it's dry as the surface will be tacky to the touch.


When you've finished work, hose off the overspray with water. You may want to wash your car by hand with a sponge and car shampoo to make sure it's all removed. Your surface should be overspray-free.


Products Used In This Tutorial


Microfibre Cloth

Farecla Finishing Cloth (Pack of 3)


3M Microfibre Detailing Cloth


Drying Cloth

Meguiars Water Magnet Microfibre Drying Towel


Masking Film

3M 5m x 120m Clear Masking Film


Overspray Masking Liquid

3M Overspray Masking Liquid Dry


Spray Gun

Fast Mover Gravity Feed Spray Gun 1.8mm Set Up with 600cc Pot



Starchem Cellulose Vehicle Sponge


Farecla G3 Professional High Shine Shampoo 500ml


Meguiars Gold Class Car Wash Shampoo & Conditioner 532ml