DOWSIL™ PR-1204 RTV Clear Silicone Sealant Primer – 309 Gram Can

DOWSIL PR-1204 by DOWSIL (Dow Corning) is a professional-grade silicone sealant primer available in 309 Gram Can format. It is designed for use on Metal, Glass, Ceramic, Plastic, Concrete surfaces, delivering long-lasting adhesion, flexibility, and environmental resistance across a wide range of industrial, commercial, and specialized applications. Clear in color, this product is trusted by maintenance professionals, OEM manufacturers, and engineers worldwide who demand consistent, specification-grade silicone performance in every application.

Technical Information

DOWSIL PR-1204 is a clear, solvent-based silicone adhesion primer formulated to significantly improve the bond strength of DOWSIL RTV silicone sealants and adhesives on difficult substrates including glass, metals, ceramics, and many plastics where direct silicone adhesion without primer is insufficient for the application requirements. The primer is applied as a thin, uniform film by brush or wipe, allowed to flash off completely, and then overcoated with the silicone sealant or adhesive. The 309 gram can format provides material for production-scale priming operations across large surface areas or multiple assemblies.

Why Choose DOWSIL PR-1204?

• Improves Silicone Bond Strength — Maximizes adhesion of DOWSIL RTV sealants on difficult substrates
• Multi-Substrate Compatible — Works on glass, metal, ceramic, plastic, and concrete surfaces
• Clear Formula — No visual impact on bonded surfaces after primer flash-off
• 309 g Can Format — Production-scale quantity for large-area or multi-part priming
• Essential for Demanding Bonds — Required for long-term silicone adhesion in wet or high-stress environments

Frequently Asked Questions

Q: What is DOWSIL PR-1204 silicone primer used for?
A: DOWSIL PR-1204 is applied to substrates before DOWSIL RTV silicone sealant or adhesive application to improve adhesion on glass, metals, ceramics, and plastics — particularly for applications exposed to water, weathering, or mechanical stress where primer-free adhesion is insufficient.

Q: What is the MPN for DOWSIL PR-1204 309 g can?
A: The Manufacturer Part Number (MPN) is 4094513.

Q: How is DOWSIL PR-1204 applied?
A: Apply PR-1204 as a thin, uniform film to the clean, dry substrate by brush or clean lint-free cloth. Allow to flash off completely for the time specified in the product datasheet before applying the silicone sealant or adhesive.

Q: Does DOWSIL 732 always require a primer?
A: DOWSIL 732 adheres to most clean, dry surfaces without primer. However, PR-1204 primer is recommended for difficult substrates, wet area applications, structural bonding, and wherever long-term adhesion under environmental stress is critical.

Q: How long does PR-1204 need to flash off before applying silicone?
A: Refer to the current DOWSIL PR-1204 Technical Data Sheet for specific flash-off times at various temperatures and humidity levels. Premature sealant application over incompletely dried primer can compromise adhesion performance.