What is the recommended uniform application rate of a prime coat?

The recommended uniform application rate of a prime coat is 0.20 to 0.50 gallons per square yard. This range is established based on achieving optimal bonding between the existing surface and the new overlay, ensuring sufficient penetration and coverage without excessive application. A prime coat functions as a preparatory layer that enhances adhesion by sealing the underlying material and providing a suitable surface for subsequent paving layers.

Utilizing a rate within this specified range strikes a balance, allowing for adequate moisture evaporation while avoiding the pitfalls of over-application, which can lead to bleeding, longer curing times, or ineffective performance of the prime coat. This makes the selected application rate essential for maintaining structural integrity and prolonging the lifespan of the roadway.