How to Clean & Care For Your Stencils

You’ve got jobs to finish and no time for sloppy stencilling. But if your stencils are coated in old paint or warped from poor storage, your next project is already off to a rough start. 

You want clean, sharp markings, whether it’s part numbers, safety instructions, or ID tags. Because when you skip proper cleaning and storage, you’re not just ruining the stencil, you’re compromising the clarity of your message, the safety of your site, and the professionalism of your work.

At Industrial Nameplates, we’ve seen the full life cycle of stencils (crisp and clean on day one, but unusable after a few weeks of rough treatment). Whether you’re working with flexible Mylar stencils or durable interlocking brass stencils, let’s walk through exactly what to do, what to avoid, and how to keep your stencils working like new.

Mylar stencils are a popular choice because they’re flexible, affordable, and easy to use. But because they’re lightweight and often used with spray paint or ink, you’ll see a buildup of residue.

Here’s how to clean them:

• Clean right after use, before the paint dries and hardens.
• Let the stencil sit for 10–15 minutes in warm water with mild dish soap.
• Gently scrub with a soft brush or sponge to remove paint or ink without bending or tearing the stencil.
• Avoid harsh chemicals. Solvents like acetone can warp or break the plastic. Stick with soap and water.
• Lay the stencil on a towel or hang it to dry. Don’t bend or roll.
• If you’re using heavy-bodied paints, try spraying a light layer of cooking spray or stencil adhesive beforehand to help the paint release more easily after use.

Brass stencils are more rigid and built to last, even in harsh industrial environments. They’re especially useful for repeat labelling jobs, such as shipping crates, equipment tags, or warehouse markings.

Here’s how to clean them:

• Wipe down after every use. A simple rag with warm water or a mild cleaner can prevent buildup.
• For dried paint, gently scrape the surface with a plastic (not metal) blade to avoid scratching the brass.
• If paint is stubborn, soak the stencils in mineral spirits or stencil cleaner, then rinse and dry thoroughly.
• Use a toothbrush for tight spots, especially between interlocking edges or fine detail areas.
• Store dry to prevent tarnish: Brass can oxidize over time, so make sure stencils are dry before storing. A light coat of oil can help preserve the finish if needed.

• Always store flat: Avoid bending or folding your stencils. This can distort the design and create uneven markings.
• Keep them organized: Use labeled folders, stencil sleeves, or storage boxes to keep sets together and prevent damage.
• Avoid stacking dirty stencils: Dried paint can transfer or stick between layers, so always clean and dry first.
• Use painter’s tape for hold-downs: It’s clean-removing and won’t damage delicate edges.

“The easiest and most reliable way to keep your stencils clean is with simple soap and water. While some might suggest using acetone, we advise against it. Mylar stencils also roll up nicely, making storage convenient and easy.” 

— Kirsten Cowie, Industrial Nameplates Identification Expert

Whether you’re stencilling safety signage or product IDs, clean stencils produce sharper results and last longer. And, of course, it saves you money because you don’t have to buy new stencils every other year or so. A little extra care (especially right after use) goes a long way in keeping both Mylar and brass stencils in top condition.

Need new stencils, replacements, or custom designs for your industrial setup? Call us at 403-930-5543, or drop an email at sales@industrialnameplates.ca. You can also fill out this form to get a quick quote! We’ve been doing this for a long time (since 1903 to be exact), so rest assured you’re in good hands.