Description
Designed to be part of a system for coating pre-finished metal siding - such as those containing Fluoro-carbon (Kynar), Silicone Polyester, or Polyester Polymers - DTM Bonding Primer can also be used for other hard slick, glossy surfaces, and previously painted surfaces.
Material Use:
DTM Bonding Primer is a waterborne, acrylic emulsion primer specifically formulated to promote adhesion on hard, slick, glossy surfaces such as pre-finished metal siding and previously painted substrates. It is designed to be used as part of a coating system and must be topcoated. This primer is ideal for use in light industrial environments, manufacturing facilities, and new construction projects where high-performance adhesion is required on difficult-to-coat surfaces.
System Components:
DTM Bonding Primer is used as the base primer in a multi-coat system. It must be topcoated with one or two coats of compatible finish coatings. Acceptable topcoats include:
- Pro Industrial Acrylic
- Pro Industrial DTM Acrylic
- Pro Industrial DTM Primer/Finish
- Pro Industrial Multi-Surface Acrylic
- Bond-Plex WB Acrylic
- Metalatex Semi-Gloss
- Sher-Cryl HPA
These topcoats are selected based on the specific application and desired finish. The primer does not provide rust-inhibitive properties, so for bare steel, a corrosion-resistant primer should be used prior to applying DTM Bonding Primer.
Applications:
DTM Bonding Primer is suitable for:
- Pre-finished metal siding including Fluorocarbon (Kynar®), Silicone Polyester, and Polyester Polymers
- Previously painted, hard, slick, or glossy surfaces
- Steel, aluminum, and galvanized metal (with proper surface preparation)
- USDA-inspected facilities
Application Details:
- Surface Preparation: All surfaces must be clean, dry, and free of contaminants. Glossy surfaces should be dulled by sanding. For pre-finished siding, clean per SSPC-SP1 or water blast per NACE RP-01-72. For previously painted surfaces, test adhesion with a 2–3 sq. ft. patch and allow to cure for 1 week.
- Application Methods: Can be applied by airless spray, conventional spray, brush, or roller. Use a 3/8" woven roller or nylon-polyester brush. Airless spray requires 2400 psi pressure with a 0.017–0.019" tip.
- Film Thickness: Apply at 5.0–12.0 wet mils (2.2–5.3 dry mils) per coat.
- Coverage: 133–320 sq. ft. per gallon depending on surface porosity and application method. Theoretical coverage is 705 sq. ft. per gallon at 1 mil dry film thickness.
- Drying Times at 8.0 wet mils, 50% RH:
- Touch: 40 minutes @ 77°F
- Handle: 4 hours @ 77°F
- Recoat: 4 hours @ 77°F
- Full Cure: 7 days @ 77°F
- Pot Life: Not applicable (single-component waterborne product)
- Cure Sensitivity: Sensitive to moisture, dew, and high humidity during the first 16–24 hours of curing. Avoid exposure to these conditions during early drying stages.
Special Notes:
- Temperature & Humidity Limits: Apply only when air, surface, and material temperatures are between 50°F (10°C) and 120°F (49°C), and at least 5°F above the dew point. Maximum relative humidity is 85%.
- UV Resistance: The primer itself is not UV stable and must be topcoated with a UV-resistant finish.
- VOC Content: Less than 50 g/L (0.42 lbs/gal), compliant with major environmental regulations including OTC, CARB, and SCAQMD.
- Shelf Life: 36 months unopened.
- Tinting: Do not tint.
- Safety: Use appropriate PPE during application. Avoid exposure to lead dust when preparing old painted surfaces. Refer to SDS for full safety guidelines.
System Use Summary:
DTM Bonding Primer is a critical adhesion-promoting base coat for coating systems applied to difficult substrates such as Kynar®-coated metal or glossy painted surfaces. It must be followed by one or two coats of a compatible topcoat such as Pro Industrial Acrylic or Sher-Cryl HPA. It is not suitable as a standalone coating and does not provide corrosion protection, so additional primers may be required for bare metal substrates. Proper surface preparation and environmental control during application are essential for optimal performance.
https://www.sherwin-williams.com/painting-contractors/products/pro-industrial-dtm-bonding-primer
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