Linear L-411, L-417, L-418 High Build DTM Epoxy Primer kit

Primer is a DTM (Direct to Metal) product — it bonds to bare metal and protects it. Acid etch and epoxy are both primers.

2K urethane is technically a surfacer, not a primer. It's breathable and offers zero metal protection — it can actually wick moisture straight down to bare metal. Never spray 2K urethane directly over bare metal.

L-Series epoxy is a true DTM primer. It goes on bare metal first and provides real corrosion protection, high build, and a sandable surface — all in one product, from metal up.

The traditional stack — epoxy, then spray poly, then 2K urethane — requires careful timing between coats. Spray poly kicks fast and can trap solvents from the epoxy underneath if you don't wait at least 24 hours. If you burn through to that layer later, the epoxy may still be soft underneath.

L-Series eliminates that stack. It's a high-build DTM epoxy that goes from bare metal through final block sanding — one product, no timing headaches, no trapped solvents between incompatible layers.

L-Series is formulated with an inorganic-organic corrosion inhibitor and anti-corrosive pigment designed to encapsulate and neutralize rust. It also contains moisture scavenger properties that actively draw moisture away from the substrate.

That said, you still need proper surface prep: thoroughly sand bare metal with no finer than 80 grit, or sandblast (no soda blast). Clean with a quality acetone cleaner before coating. Do not use an etch primer underneath L-Series — it's a DTM product that bonds directly to metal.

65°F minimum panel temperature for at least 48 hours after application. This is non-negotiable — if you can't keep the panel above 65°F for two full days, don't spray L-Series until you can.

The slow cure is by design (solvents need time to escape), but it only works if the environment cooperates. Don't epoxy something and shut the heat off overnight — you're asking for problems. Spray in a warm environment and keep it warm.

No — faster is actually worse. Fast-curing primers skin over before the solvents underneath have fully escaped. Those trapped solvents continue to evaporate slowly, causing the primer to shrink over time. That shrinkage telegraphs scratches and imperfections up through your paint weeks or months after the job is done.

L-Series cures slowly by design. The 48-hour window lets all solvents escape before the surface seals, so what you block is what stays. No late shrinkage, no ghost scratches appearing after paint.

Every sprayable product contains solvents that evaporate as it cures. More solvent = more mass loss = more shrinkage.

L-Series measures 65% solids by volume and 76% solids by weight. Volume is what determines how much build stays on the panel after solvents flash off — 65% by volume is exceptionally high for an epoxy primer. Less shrinkage means the surface you block stays true, and the finish you see after clear is the finish you keep.

Most epoxies are loaded with vinyl to make them flexible, but vinyl makes the product gummy when you sand it. Paper clogs almost immediately and you spend more time cleaning or replacing sandpaper than actually blocking.

L-Series sands to a fine, dry powder. The paper stays clean, the block glides, and you can actually feel what the surface is doing. It also acts as its own guide coat — the color and sheen difference between high and low spots is visible without spraying a separate guide coat.

Yes, but L-Series must be thoroughly sanded with 80–180 grit before applying filler or glazing putty. The epoxy needs mechanical tooth for the filler to grip.

This makes L-Series ideal for the common workflow: bare metal → L-Series epoxy → sand → body filler → re-prime with L-Series → block sand → topcoat. One product handles both the initial metal seal and the final surfacing.