Laser Marking Compounds

Bare metal does not absorb CO2 (10.6 µm) or diode (~450 nm) wavelengths well, so direct marking is impossible without a fiber laser. The workaround: coat the metal with a "marking compound" that fuses to the surface under laser heat, then wipe off the residue. This category exists because of the gap between cheap CO2/diode lasers and expensive fibers.

Commercial marking compounds

• ★ CerMark LMM-6000 (black) — closed product, paid (~$50–$80 per 100 mL bottle); the gold-standard CO2/diode marking compound for stainless steel, brass, titanium, anodized aluminum. Spray, dry, fire, wipe. Permanent black mark. The "tumbler shop" default.
• ★ CerMark Ultra (CerMarkUltra.com) — paid; lower-power formulation that works on diode lasers (10 W+ on 304 stainless).
• Thermark LMM-14 (black) / LMM-25 (laminate sheets) — closed, paid; original brand (now owned by Ferro). Same physics as CerMark; older.
• MarkSolid 100 (black) / 175 (white) — paid; European alternative; available through Trotec.
• CerMark TR (transfer film) — sheets you press onto curved surfaces. Easier than spraying tumblers.

Cheaper alternatives (pastes / sprays / DIY)

• ★ Brilliance Lasers BL-100 / BL-200 — paid; cheaper CerMark alternative; performance close to CerMark on stainless with diode lasers.
• MOLY Spray (Molybdenum disulfide dry-film lubricant) — closed, paid (~$15 spray can); the famous "DIY CerMark" hack — works on stainless, mild steel, anodized aluminum at a fraction of the cost. Quality varies by brand (LPS / Permatex / WD-40 Specialist).
• Dykem layout fluid — paid (~$10); blue/red metal-marking dye; weak laser interaction but used as a base on dark engraves.
• Tempera paint (white) — community DIY for CerMark-on-glass; cheap, mediocre results.
• Norton white tile / dollar-store white tile — combined with TiO2 paint and 10 W+ diode → high-contrast black photo engraves on white ceramic. Free, classic.

Specialized compounds

• CerMark Aluma-Black / dark colors — for non-anodized aluminum.
• Mr. Sandman / SandCarver compounds — sandblast-related, not laser, but adjacent.
• Markal / Sharpie permanent marker (white/silver) — community trick for high-contrast contrast on dark glass before raster engraving.

Application methods

• Aerosol spray (CerMark spray can) — fastest; uneven thickness; wastes product.
• Airbrush + thinned CerMark — best result; most controlled.
• Roll-on (with Wagner sprayer / sponge applicator) — large-area work; less waste.
• Pre-painted tumbler dip — dunk + spin-dry; production-shop trick.
• Heat-cure — some compounds want a quick warm-up before lasering for adhesion.

Power-class guidance

• 40 W CO2 + CerMark — standard recipe; reliable on stainless / brass / titanium.
• 10 W diode + CerMark Ultra / MOLY — works but slower; multiple passes typical.
• 5 W diode + CerMark Ultra — possible on very thin coatings; marginal.
• Fiber 20 W+ — usually direct marking; CerMark unnecessary.
• MOPA fiber — direct marking + color; CerMark unnecessary.

Anodizing prep (the "real" way to mark aluminum)

• Anodized aluminum — laser bleaches the dye out of the anodic layer. Pre-anodized stock (Inventables black anodized aluminum / Caliburger plate stock) marks beautifully on diode and CO2 without any compound. Often the better answer than CerMark.
• Cerakote — paid; ceramic-polymer coating popular on firearms; lasers cleanly off pre-coated parts.

Pick this if…

• CO2 + tumbler shop, willing to pay: CerMark LMM-6000 + airbrush.
• Diode laser, want metal marking: CerMark Ultra or MOLY spray.
• DIY budget: MOLY spray ($15 can, lasts months).
• High-volume production: CerMark TR transfer film + a roller jig.
• Pre-coated aluminum products: stop using compound — buy anodized stock or Cerakote it once.
• Direct-mark bare steel without compound: you want a fiber laser.