Professional surface preparation standards for Cerakote ceramic coating applications. Complete procedures, cleaning protocols, and quality control for gunsmiths.
Proper surface preparation is the foundation of successful Cerakote ceramic coating applications. Poor prep work results in adhesion failures, uneven coverage, and premature coating degradation. This comprehensive guide establishes professional standards for surface preparation across common firearm substrates.
Initial Assessment and Disassembly
Begin with complete disassembly of the firearm, removing all components that will not receive coating. Document the original finish condition and identify any surface defects requiring attention. Check for existing coatings, anodizing, or case hardening that may affect preparation procedures.
Inspect for deep scratches, pitting, or corrosion that requires mechanical removal before coating. Light surface oxidation can typically be addressed during the blasting process, but heavy corrosion may require pre-treatment with phosphoric acid solutions.
Degreasing Protocol
Complete degreasing is essential before any mechanical preparation. Use a three-stage cleaning process: initial solvent wipe, ultrasonic cleaning, and final degreasing immediately before coating application.
Stage one involves wiping all surfaces with acetone or brake cleaner to remove heavy oils and fingerprints. Follow with ultrasonic cleaning in heated alkaline detergent solution at 140-160°F for 10-15 minutes. Rinse thoroughly with distilled water and dry immediately.
Final degreasing uses acetone applied with lint-free cloths, working from clean areas toward contaminated zones. Replace cloths frequently and allow complete evaporation before proceeding. Do not touch degreased surfaces with bare hands—even trace skin oils will cause adhesion failures at those points.
Media Blasting Standards
Media blasting creates the surface profile necessary for Cerakote adhesion. The blasting process removes oxidation, smooths machining marks, and creates a consistent anchor profile across the substrate. Use 80-120 grit aluminum oxide for steel substrates at 60-80 PSI. For aluminum alloys, reduce to 100-200 grit glass bead at 40-60 PSI to prevent surface distortion.
Maintain a consistent blasting angle of 45-60 degrees to the surface. Perpendicular blasting creates a peened surface that reduces adhesion. Work in overlapping passes to ensure complete coverage. After blasting, verify the surface exhibits a uniform matte profile with no shiny spots indicating missed areas or insufficient coverage.
Water Break Test
The water break test is the definitive verification of surface cleanliness before coating application. Apply distilled water to the prepared surface and observe the behavior. Properly cleaned surfaces cause water to sheet uniformly in a continuous film with no beading or channeling. Any water beading indicates oil contamination requiring additional degreasing.
Perform the water break test after each stage of preparation. A surface that passes after blasting but fails after handling has been contaminated and requires re-degreasing before application. Do not apply Cerakote to any surface that fails the water break test—the adhesion failure will manifest immediately after curing.
Substrate-Specific Considerations
Steel components require the standard aluminum oxide blasting procedure. Stainless steel requires similar preparation but benefits from slightly finer media (100 grit) to prevent excessive surface roughness that can telegraph through thin coatings. Verify stainless components are completely free of passivation coatings before blasting.
Polymer frames and components require special handling. Do not blast polymer substrates—the media will damage the surface. Instead, lightly scuff with 320-grit sandpaper and clean thoroughly with isopropyl alcohol. Some polymer formulations are incompatible with Cerakote; test adhesion on an inconspicuous area before full application.
| Substrate | Media Type | Grit / PSI | Special Notes |
|---|---|---|---|
| Carbon steel | Aluminum oxide | 80–120 / 60–80 PSI | Standard procedure |
| Stainless steel | Aluminum oxide | 100 / 60 PSI | Remove passivation first |
| Aluminum alloy | Glass bead | 100–200 / 40–60 PSI | Avoid distortion |
| Polymer | No blasting | 320-grit scuff only | Test adhesion first |
| Titanium | Aluminum oxide | 80 / 40–60 PSI | Extended degreasing required |