"I experimented with Emerald to paint the stucco exterior of a house in Florida. According to the specifications "Emerald™ Exterior provides a thicker more flexible coating for superior resistance to peeling & blistering".
Painters in hot climates know about the thermal expansion problems Acrylic latex is prone too. Fairly innocuous thermal cracks in stucco not only ruin a nice finish they can kill the re saleability of the property.
The usual solution is to use short life elastomeric paints that require reapplication every 7 years and need complete removal before repainting.
As an experimental alternative, I mixed Roll a tex texture sand in with the Emerald exterior paint at a box and a half per gallon to make acrylic stucco/paint. The Sherwin Williams paint calculator said I needed 3 gallons per coat. I rolled 4 gallons per coat of the Stucco texture mix with a 3/4 nap roller.
After about a week dry time It needed a second coat, so I used two additional gallons Emerald paint without texture sand to cover primer bleed through and even out the satin sheen.
Obviously Emerald is a good paint, rolls well with no drips and it may not be fair for me to deduct a star for having to roll a second coat to completely hide the white primer.
I suspect that the single coat coverage only applies when certain bases are used, the product is sprayed and/or the primer is tinted and the customer is satisfied with exposed primer and less than optimum sheen and durability.
Does make a really nice textured finish with the roll a tex sand if you prime first and apply two coats of the Emerald!"