St. Louis Crayon & Soapstone Supermark EPDM Marking Crayon, White

The St. Louis Crayon & Soapstone Supermark is a marking crayon designed for rubber membranes, including EPDM, PVC and TPO. It delivers durable, high-visibility marks that resist running or spreading even in hot climates. One white crayon per piece; pairs with standard roof layout and detailing work on single-ply membranes.

Key Features:

• Membrane-safe marking: Designed specifically for marking on PVC, EPDM and TPO roofing membranes.
• Heat resistant: High melting point keeps marks intact even in the hottest climates.
• No smearing: Resists running or spreading on rubber surfaces.
• Industry standard: Widely used across the roofing industry and by major tire manufacturers and industrial leaders.
• Durable marks: Marks hold up during layout, seaming and inspection work.
• High visibility: White crayon color reads clearly on dark rubber membranes.

Specifications Table:

Coverage & How Much You Need:

One crayon covers marking needs across typical roll layout and flashing detail work; coverage depends on marking density, not area.

Fit and Compatibility:

Use on EPDM, PVC and TPO single-ply membranes and other rubber surfaces. No additional tools required; pair with chalk lines and seam rollers for membrane layout work.

Frequently Asked Questions (FAQ):

Q: What is included?
A: One white Supermark EPDM marking crayon per piece.

Q: Will the marks wash off or smear in heat?
A: The crayon has a high melting point and is formulated to resist running or spreading, even in hot climates.

Q: Can I use it on PVC and TPO as well as EPDM?
A: Yes, it is designed to be the perfect crayon for marking on PVC, EPDM and TPO.

Q: Is it suitable for jobsite use beyond roofing?
A: Yes, it is also used by tire manufacturers and a variety of industrial leaders.

Q: How is it sold?
A: It is sold per piece.

Expert Verdict Reviewed by the SuperArbor Pro Desk

Keep a Supermark crayon in every membrane crew’s tool pouch; white is the go-to on dark EPDM for seam and layout marks. Because it resists running in heat, marks made in summer conditions stay legible through the day. Store crayons out of direct sun in the truck to keep points sharp.

Use only on scrap or non-exposed areas if mark removal matters, since crayon marks on membranes may not be removable.

Order the St. Louis Supermark EPDM crayon in white and keep crisp, heat-proof layout marks on every membrane job.