A seam repair must suit the existing membrane and its condition. Different roof materials can require different preparation and repair methods. A product advertised for roof leaks is not automatically compatible with every seam.
What to do next
Ask the contractor to identify the membrane before proposing a repair. Request an explanation of cleaning, preparation, and the repair detail. Where previous incompatible patches exist, ask how they will be handled instead of adding another layer without investigation.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.