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  • Overview
  • Specs
  • Coverage Rate
  • Cure
  • Application

Metal Surface Universal Acrylic Primer

This self cross-linking acrylic primer is designed for construction and maintenance applications and is engineered for surfaces where rust and corrosion resistance is critical. Pro Industrial Pro-Cryl Universal Primer is a water-based alternative to solvent-based metal primers.  It can be used on all bare steel, aluminum and galvanized substrates (when any oils are removed) and is ideal for structural steel, machinery, piping or equipment found in schools, hospitals, hotels, commercial buildings and industrial sites.   With a unique formulation that crosslinks for tighter film formation, it provides better resistance to moisture and long-term corrosion resistance and the ideal foundation across a wide variety of interior and exterior end-uses.

It can be used under a wide range of acrylics, alkyds, epoxies and urethanes – for easier protection and maintenance in high-performance applications.   It comes in 1 gallon and 5 gallon containers in off white, red oxide and gray colors.  Not designed for floors.

Pro-Cryl is a great metal primer when used with our Cool Coat Thermal Barrier Paint.

None required

Many products are suitable as topcoats including a wide range of acrylics, alkyds, epoxies and urethanes.

Where is Pro Cryl Metal Surface Primer typically used?

  • Structural steel, machinery, piping or equipment, metal roofs and walls
  • Doors and joints, handrails, bollards, beans and columns
  • Schools, hospitals, hotels, commercial buildings and industrial sites.

Why Pro Cryl Metal Surface Primer?

  • Single-component, rust-inhibitive primer for steel, aluminum, and galvanized steel
  • Recommended when a corrosion-resistant primer is required
  • Alternative to conventional solvent-based primers
  • Accepts all acrylic, alkyd, urethane, epoxy topcoats – solvent and water base
  • Early moisture resistant
  • Quick dry to recoat time for faster project turnaround
  • Low temperature application down to 40F
  • Available in red-oxide, gray and off-white
  • Acceptable for use in USDA-inspected facilities
  • Complies with SCAQMD, CARB, OTC and LEED 09 requirements


Solids By Weight 49%   By Volume 38%
VOC  <50 g/L
Colors  Off white, medium gray, red oxide
Recommended Film Thickness  5-10 mils wet, 1.9-3.8 mils dry
Coverage per Gallon  160-320 sq’/gal @5-10 mils wet thickness
Packaging 1 gallon, 5 gallon
Mix Ratio single component
Shelf Life 3 years in unopened container
Corrosion Weathering ASTM D5894, 10 cycles, 3360 hours, passed
Dry Heat Resistance ASTM D2485  at 200F
Direct Impact Resistance ASTM D2794 >14o in lbs
Flexibility ASTM D522 180 degree bend 1/4″ mandrel
Adhesion ASTM D4541 500 psi
Pencil Hardness ASTM D3363  B
 Salt Fog Resistance ASTM B117, 1250 hours passed
Moisture Condensation Resitance ASTM D4585 100F, 1250 hours, passed
Limitations Not designed for floors, apply topcoat within 14 days, No painting should be done immediately after a rain or during foggy weather.


Coverage Per Gallon  160-320 Sq’/Gal @5-10 Mils Wet Thickness


Drying Time @6.0 mils wet 50% RH

Drying Time 40F 77F 120F
To touch 2 hrs 40 min 20 min
Tack free 8 hrs 2 hrs 1 hr
To recoat 16 hrs 4 hrs 2 hrs


WARNING! Removal of old paint by sanding, scraping or other means may generate dust or fumes that contain lead. Exposure to lead dust or fumes may cause brain damage or other adverse health effects, especially in children or pregnant women. Controlling exposure to lead or other hazardous substances requires the use of proper protective equipment, such as a properly fitted respirator (NIOSH approved) and proper containment and cleanup. For more
information, call the National Lead Information Center at 1-800-424-LEAD (in US) or contact your local health authority.

Surface must be clean, dry, and in sound condition. Remove all oil, dust, grease, dirt, loose rust, and other foreign material to ensure adequate adhesion.

Do not use hydrocarbon solvents for cleaning. Iron and Steel – Minimum surface preparation is Hand Tool Cleaning per SSPC-SP2. Remove all oil and grease from the surface per SSPC-SP1. For better performance, use CommercialBlast Cleaning per SSPC-SP6. Self priming.

Aluminum – Remove all oil, grease, dirt, oxide and other foreign material per SSPC-SP1.Self priming.

Galvanizing – Allow to weather a minimum of six months prior to coating. Solvent Clean per SSPC-SP1. When weathering is not possible, or the surface has been treated with chromates or silicates, first Solvent Clean per SSPC-SP1 and apply a test patch. Allow paint to dry at least one week before testing adhesion. If adhesion is poor, brush blasting per SSPC-SP16 is necessary to remove these treatments. Rusty galvanizing requires a minimum of Hand Tool Cleaning per SSPC-SP2, prime the area the same day as cleaned. Self priming.

Previously Painted Surfaces – If in sound condition, clean the surface of all foreign material. Smooth, hard or glossy coatings and surfaces should be dulled by abrading the surface. Apply a test area, allowing paint to dry one week before testing adhesion. If adhesion is poor, additional abrasion of the surface and/or removal of the previous coating may be necessary. Retest surface for adhesion. If paint is peeling or badly weathered, clean surface to sound substrate and treat as a new surface as above. Recognize that any surface preparation short of total removal of the old coating may compromise the service length of the system.

Wood – Surface must be clean, dry and sound. Prime with recommended primer. No painting should be done immediately after a rain or during foggy weather. Knots and pitch streaks must be scraped, sanded and spot primed before full coat of primer is applied. All nail holes or small openings must be properly caulked.

Apply paint at the recommended film thickness and spreading rate as indicated on front page. Application of coating below minimum recommended spreading rate will adversely affect coating performance.

Refer to the SDS sheets before use. FOR PROFESSIONAL USE ONLY
Published technical data and instructions are subject to change without notice. Contact your Sherwin-Williams representative for additional technical data and instructions.

Stripe coat crevices, welds, and sharp angles to prevent early failure in these areas. For best results on rusty surfaces, always apply first coat by brush.

No painting should be done immediately after a rain or during foggy weather. When using spray application, use a 50% overlap with each pass of the gun to avoid holidays, bare areas, and pinholes. If necessary, cross spray at a right angle.

For optimal performance, this primer should be topcoated. For exterior exposure, this primer should be topcoated within 14 days. If 14 days is exceeded remove all surface contamination by washing with an appropriate cleaner, rinse thoroughly and allow to dry. Finish with appropriate topcoat.