Coating application depends on product-specific environmental and substrate conditions. Weather affects scheduling as well as preparation and curing. A calendar promise should not override the selected manufacturer's requirements.
What to do next
Ask how the contractor checks conditions and handles a weather interruption. Clarify how partially completed work and materials will be protected. Record schedule assumptions in the proposal so delays caused by unsuitable conditions are managed transparently.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.