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Awlgrip Application Guide › Surface Preparation › Aluminum

Aluminum Surface Preparation for Awlgrip

Aluminum substrates require specific cleaning, profiling, and corrosion-protection priming to achieve a yacht-grade Awlgrip finish. Per the official Awlgrip YPAC training, prepped aluminum must be primed within 8 hours to prevent oxide regrowth.

Need help with a project? Call our coatings team: 321-639-3046

Quick Answer: How Do You Prep Aluminum for Awlgrip?

  • Clean and degrease — remove rolling oils, salt, and contamination
  • Grind with 36-grit disc or grit blast to bright aluminum (Awlgrip official spec)
  • Or for less aggressive prep: sand P180–P220 on already-clean aluminum
  • Achieve a 50–75 micron (2–3 mil) profile by aluminum oxide blast
  • Remove dust by vacuum and clean compressed air
  • Prime within 8 hours to prevent corrosion and oxide regrowth
  • Apply Max Cor CF + Hullgard Extra + 545 Epoxy Primer before topcoat

Aluminum begins oxidizing immediately after preparation — the 8-hour prime window is non-negotiable.

Select Your Aluminum Scenario

Aluminum — No Fairing

Standard aluminum surfaces where no filler or fairing compound is needed.

View System Options →

Aluminum — Fairing Required

Aluminum requiring filler or fairing compound for surface leveling.

View System Options →

Anodized Aluminum

Anodized aluminum surfaces requiring special preparation.

View System Options →

Aluminum Prep at a Glance

StageTool / ProductAwlgrip Official Spec
Clean / degreaseDetergent, steam, or pressure wash + alkaline degreaserRemove rolling oils, salt, contamination
Aggressive prep36-grit grinding disc OR aluminum oxide blastBright aluminum, 50–75 micron (2–3 mil) profile
Light prepP180–P220 sandpaperAlready-clean aluminum, no corrosion
Dust removalVacuum + clean compressed airNo oil-contaminated air; no shop rags — fibers wick moisture
Prime windowWithin 8 hours of prepPer Awlgrip YPAC corrosion guidance
Anti-corrosive primerMax Cor CF (R4330 + R3330)2:1 mix, 0.8–1.4 mils WFT, spray only
Wash primer (alt.)Wash Primer CF (D6600 + D3300)1:1 mix, no reduction; for stainless & anodized aluminum
Substrate primerHullgard Extra (D6120 + D3730)10:1.5 mix, reduce 5–15%, recoatable up to 6 months
Finish primer545 Epoxy Primer1:1:½ mix, 2–3 coats, 2–3 mils DFT

The Awlgrip Anti-Corrosive System for Aluminum

Per the official Awlgrip YPAC training, the ultimate anti-corrosive system on aluminum is:

  1. Step 1Apply Max Cor CF — 1 coat at 0.8–1.4 mils WFT
  2. 17 hrsApply Hullgard Extra — (or High Build with T0176 reducer for VOC areas)
  3. 2 hrsApply 545 Primer — first coat, 2–3 mils WFT
  4. 1 hrApply 545 Primer — second coat, 2–3 mils WFT
  5. 12 hrsApply topcoat — 2–3 coats Awlgrip, Awlcraft 2000, or Awlgrip HS

Important: Max Cor CF cannot be topcoated directly. It must always be overcoated with Hullgard Extra or High Build first, then 545 before topcoat.

Aluminum — No Fairing Required

1

Clean

Thoroughly clean using detergent, steam cleaner, or pressure washer. Remove rolling oils, salt, and shop contamination before any abrasive work.

2

Degrease

Wipe down using Awlprep Plus T0115 or alkaline degreaser. Critical for removing oils that abrasive prep would otherwise drive into the surface.

3

Profile

Two options per Awlgrip:

  • P180–P220 — light prep on clean aluminum
  • 36-grit grinding disc — aggressive prep to bright metal (YPAC official)
4

Dust Removal

Vacuum debris and blow off with clean (oil-free) compressed air. Do not wipe with rags — fibers can embed in the metal profile and act as moisture wicks.

5

Prime Within 8 Hours

Apply substrate primer within 8 hours of prep to prevent oxide regrowth. Choose system based on application requirements (see options below).

Recommended Awlgrip Systems — Aluminum, No Fairing

  • System 1 (Standard): Hullgard Extra → High Build → 545 Epoxy Primer → Awlgrip Topcoat
  • System 2 (Maximum corrosion protection): Max Cor CF → Hullgard Extra → High Build → 545 → Topcoat
  • System 3 (Stainless / anodized aluminum): Wash Primer CF → 545 Epoxy Primer → Topcoat
  • System 4 (Production / fast turnaround): Quick Build Sealer → Awlgrip Topcoat (no pre-primer required, same-day paint)
  • System 5 (Simplified): 545 Epoxy Primer → Awlgrip Topcoat (when corrosion risk is low)

Aluminum — Fairing Required

When the aluminum surface requires fairing compound for leveling or correcting imperfections, the substrate prep must be more aggressive to give the fairing compound mechanical bite.

Preparation MethodDescription
Aluminum oxide blast50–75 micron (2–3 mil) anchor profile to bright metal
Power disc grindingP36–P60 grit disc to expose bright aluminum

Awlfair Fairing Compounds

  • Awlfair LW (D8200 + D7200/D7222) — standard trowelable fairing, 1:1 mix
  • Awlfair FL — flexible fairing for vibration areas
  • Awlfair Surfacing Filler — finishing filler for fine detail work
  • Sprayable Fairing Compound (D6001 + D3011) — for large surfaces, spray only

Recommended System — Aluminum with Fairing

  • System 6: Max Cor CF + Hullgard Extra → Awlfair LW (or Sprayable Fairing) → High Build → 545 → Awlgrip Topcoat

Critical sequence note: Per Awlgrip's official guidance, Awlfair LW must be overcoated with High Build or Ultra Build before going to a finish primer. Never apply 545 directly over fairing compound.

Anodized Aluminum

Anodized aluminum requires breaking through the anodized coating to expose mechanical bite. Fairing compounds must not be applied to anodized surfaces.

SurfacePreparation
Parts & small componentsSand P80–P120
Architectural aluminumBreak through anodized coating to bright metal for mechanical adhesion

Recommended Systems — Anodized Aluminum

  • System 8: Hullgard Extra → High Build → 545 Epoxy Primer → Topcoat
  • System 9 (Production): Quick Build Sealer (direct application) → Topcoat
  • System 10 (Simplified): 545 Epoxy Primer → Topcoat
  • Wash Primer CF option: Wash Primer CF (D6600) is specifically designed for stainless steel and anodized aluminum — 1:1 mix, no reduction, overcoatable for up to 6 months without sanding
Pro Tip: Wash Primer CF is the fastest path to a yacht-grade finish on anodized aluminum or stainless. Per the YPAC training: apply 1 coat at 2–4 mils WFT, then anywhere from 1 hour to 6 months later, apply 2–3 coats of Awlgrip, Awlcraft 2000, or Awlcraft SE directly. Optionally apply 545 between for surfacing. The 6-month overcoat window is a major productivity advantage for production yards and parts assembly.
Watch Out — Galvanic Contamination: Never use steel-contaminated abrasives or grinding discs on aluminum. Iron particles embedded in the surface will cause galvanic corrosion under the coating — visible rust spots blooming through the topcoat months later. Use dedicated aluminum oxide abrasives only, and never reuse abrasives previously used on steel. Likewise, never wipe prepared aluminum with shop rags — the fibers wick moisture into the metal profile and cause adhesion failure.

Recommended Products for Aluminum Prep

Max Cor CF

R4330 base + R3330 converter

Anti-corrosive epoxy for aluminum & steel. 2:1 mix, 0.8–1.4 mils WFT, spray only. Must be overcoated with Hullgard or High Build — not topcoated directly.

View Max Cor CF Guide →

Wash Primer CF

D6600 base + D3300 converter

Etch primer for stainless & anodized aluminum. 1:1 mix, no reduction. Overcoat window 1 hour to 6 months.

View Wash Primer Guide →

Hullgard Extra

D6120 base + D3730 converter

Epoxy substrate primer for direct application to aluminum. 10:1.5 mix, reduce 5–15%. Recoatable up to 6 months without sanding.

View Hullgard Extra Guide →

High Build Epoxy

D9002 / D8002 + D3002

Surfacing primer over Max Cor CF or Hullgard. 1:1 mix, reduce 10–20%. T0176 reducer for VOC areas.

View High Build Guide →

545 Epoxy Primer

D8001 (white) / D1001 (gray) + D3001

The finish primer before topcoat. 1:1:½ mix, 2–3 coats at 2–3 mils DFT.

View 545 Technical Guide →

Quick Build Sealer

Multi-color sealer / surfacer

Same-day paint productivity primer. Sealer 4:1:1.5 mix, 1.2 mils DFT. Direct to aluminum, no pre-primer required.

View Quick Build Guide →

Awlfair LW Fairing

D8200 base + D7200 / D7222 converter

Trowelable fairing for aluminum. 1:1 mix. Must be overcoated with High Build before 545.

View Fairing Guide →

Awlprep Plus / 400

T0115 / T0170

Surface cleaners for the two-cloth wipe. T0115 strong solvent, T0170 hot weather.

Shop Solvents →

Common Aluminum Prep Questions

What grit should I sand aluminum to before priming?
Short answer: Per Awlgrip official YPAC, two options: P180–P220 for light prep on already-clean aluminum, or aggressive 36-grit grinding disc / aluminum oxide blast to a 50–75 micron profile to bring out bright metal.
Long answer: Awlgrip's official guidance for aluminum is more aggressive than for fiberglass. The 36-grit disc spec sounds coarse, but it's needed to break through aluminum oxide and expose bright metal where the primer can chemically bond. P180–P220 is acceptable on already-clean, oxide-free aluminum. For maximum corrosion protection, blast with aluminum oxide to a 50–75 micron (2–3 mil) anchor profile. Whichever method you use, prime within 8 hours.
Why must aluminum be primed within 8 hours?
Short answer: Aluminum oxidizes immediately on exposure to air. The aluminum oxide layer reforms within hours and prevents primer adhesion. Awlgrip's official YPAC training calls for priming within 8 hours of prep.
Long answer: When you grind or blast aluminum, you remove the oxide layer and briefly expose bright reactive metal. Within hours, atmospheric oxygen begins reforming the oxide layer, and within 24 hours a fresh oxide layer is established. Primer applied over this regrown oxide does not bond chemically — it just sits on top of the oxide. The 8-hour rule from Awlgrip's training is a practical guideline: prime same-shift, same-day. If priming is delayed beyond 8 hours, re-prep (re-blast or re-sand) immediately before priming.
Can I apply Awlgrip topcoat directly over Max Cor CF?
Short answer: No. Per the official Awlgrip YPAC procedure, Max Cor CF must be overcoated with Hullgard Extra or High Build first, then 545 Primer, before any topcoat.
Long answer: Max Cor CF uses Controlled Fusion technology specifically engineered for adhesion to bare metal — that's its job. It's not formulated to support topcoat hold-out, gloss, or color. The official Anti-Corrosive System sequence is: Max Cor CF (1 coat, 0.8–1.4 mils WFT) → Hullgard Extra after 17 hours → 545 after 2 hours → second coat 545 after 1 hour → topcoat after 12 hours. Skipping any layer compromises the system. Note: unlike its predecessor Mil Spec 30-Y-94, you cannot apply topcoat over Max Cor CF directly.
What is the mix ratio for Max Cor CF?
Short answer: 2 parts base (R4330) to 1 part converter (R3330), by volume. Reduce with T0006 if needed. Apply at 0.8–1.4 mils WFT, spray only, 1 coat.
Long answer: Max Cor CF is specifically a 2:1 mix — this is different from many other Awlgrip primers. WFT is 0.8–1.4 mils (20–34 microns); DFT is 0.6–1.0 mil (15–25 microns). Spray application only. Recoat with Hullgard Extra at 17 hours at 77°F (7 hours at 95°F), and the maximum overcoat window is 72 hours. Exceeding the maximum window means the system needs to be removed and restarted — this is firm, not a guideline.
How do I prep anodized aluminum for Awlgrip?
Short answer: Sand P80–P120 to break through the anodized coating, or use Wash Primer CF as an etch coat. Do NOT apply fairing compounds to anodized surfaces.
Long answer: Anodizing creates a hard oxide layer that resists primer adhesion. The fix is mechanical: sand P80–P120 until you break through to bright aluminum where the primer can bond. Wash Primer CF (D6600) is specifically designed for anodized aluminum and stainless — 1:1 mix, no reduction, with a 1-hour to 6-month overcoat window. Fairing compounds cannot be applied directly to anodized aluminum because the anodized surface lacks the mechanical bite fairing requires.
What is Quick Build Sealer and when do I use it on aluminum?
Short answer: Quick Build Sealer is a multi-color same-day-paint primer that can be applied direct to prepped aluminum with no pre-primer, then topcoated the same day with no sanding required.
Long answer: Quick Build Sealer is Awlgrip's productivity primer for new-boat dealers, production builders, and fast boatyard work. Sealer mix is 4:1:1.5 (base:converter:reducer), DFT 1.2 mils, spray only. Available in 6 standard bases that mix to 65+ custom colors so the primer can be tinted close to the topcoat for better hide. Critical productivity feature: Quick Build Sealer applied direct to prepped aluminum, with Awlcraft 2000 or Awlcraft SE applied the same day for finished topcoat — full system in one day. No sanding of the sealer required before topcoat. Quick Build Surfacer (3:1:1, 4.7–5.5 mils DFT) is the higher-build version for surfaces needing fill.
Can I use steel grinding discs on aluminum?
Short answer: No. Iron particles from steel-contaminated abrasives embed in the aluminum surface and cause galvanic corrosion that blooms rust spots through the topcoat months later.
Long answer: This is one of the most common — and most expensive — mistakes on aluminum prep. Use only dedicated aluminum oxide abrasives that have never touched steel. Same applies to grit-blast media: aluminum oxide media used in a steel-contaminated blast room will deliver iron particles to the aluminum surface. The corrosion may not appear for 3–12 months, but when it does, the only fix is to strip and re-prep the affected area. Designate "aluminum-only" abrasives in your shop and label them clearly.
Where can I buy Awlgrip aluminum prep products in Florida?
Short answer: Fiberglass Florida stocks the full aluminum prep system — Max Cor CF, Wash Primer CF, Hullgard Extra, High Build, 545, Quick Build, Awlfair LW, and aluminum oxide abrasives — and ships statewide from Brevard County.
Long answer: We stock every product mentioned in this guide and can spec a complete aluminum prep + primer + topcoat package. Browse the Awlgrip catalog, call 321-639-3046, or email orders@fiberglassflorida.com for same-day shipping on in-stock items.

Related Awlgrip Surface Preparation Guides

Need Help With Your Aluminum Project?

Our coatings team can spec the full anti-corrosive system for your aluminum substrate — with same-day shipping on in-stock items from Brevard County, Florida.

Call 321-639-3046 or email orders@fiberglassflorida.com

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