Acrylic vs. styrene-acrylic vs. PU for exterior emulsions

Choosing a binder for an exterior emulsion is rarely about a single 'best' chemistry — it is about which trade-offs you can afford to make.

Pure acrylics lead on weathering and alkali resistance; styrene-acrylics trade some UV durability for cost; PU dispersions buy toughness and adhesion at a price. The right answer depends on the film's real service conditions.

This note walks through a simple decision order — service environment, then durability floor, then cost ceiling — that keeps the choice defensible.