Asphalt companies are expected to do a professional job every time, and they don't want to be called back to redo the work.
To ensure the asphalt adheres properly the first time, it's important to have a clean surface. Debris left behind can come loose, taking asphalt with it.
Using a commercial leaf blower to clean the surface will ensure a higher quality seal-coat.
Advantages of a Backpack Leaf Blower
Seal coating is done to fill cracks and crevices, restore a smooth finish, and extend the life of the asphalt. But if you leave debris in the cracks and crevices you're filling, you're leaving loose material that can allow the overlying seal coating to come loose with it after you're finished.
A backpack leaf blower allows you to aim the nozzle directly at the cracks to blow out all dust, dirt, and debris.
These are great finishing tools for larger jobs, but can even be your primary unit for smaller jobs like driveways.