Signs Protected with Sign Muscle® Far Outperform the Competition

What is Sign Muscle®?

Sign Muscle® was developed by the National Marker Company and is a revolutionary, crystal clear, tough, polymer coating that encapsulates printed images and text on the surface of a variety of substrates. The liquid monomer, Sign Muscle®, is applied to the substrate after the printing and curing process, creating a high strength bond. This creates extremely durable signs and labels for both indoor and outdoor use. Sign Muscle® protects your signs from:

Quality Signs









  • Chemicals
  • Graffiti
  • Harsh Environments
  • UV-Rays
  • Fading
  • Scratches
  • Scuffs
  • Water
  • Mold

Scroll down to see the Full Chemical Resistance Chart

How Much Does Sign Muscle® Cost?

All National Marker Signs you buy from Tanner has Sign Muscle® added for FREE! Sign Muscle® not only prolongs the life of your signs, but also enhances the color and clarity of the sign as well. In addition, National Marker Signs with Sign Muscle®, come with a lifetime warranty and are manufactured here in the USA. Get the highest quality signs in the industry today at Tanner.


National Marker Signs Now Available at Tanner

Tanner is happy to announce the addition of National Marker Signs, all with FREE Sign Muscle® protection, to our ever growing product offerings. Tanner carries a large inventory of the most popular safety signs for rapid processing and fast shipping – Can ship same day if order is placed before 2PM. In addition to the standard National Marker Signs, we are now offering Custom Made Signs. For more information about Custom Signs please feel free to contact one of our customer service reps – Phone: 800-456-2658 | Email:

Shop Readily Available Safety Signs at Tanner Now

Chemical Resistance Chart

A = Excellent  B = Very Good  C = Poor

Chemical Resistance Chart