Polyester resins with carboxyl or hydroxyl end groups are cured with TGIC, HAA or blocked isocyanates. The result resists ultraviolet light far better than epoxy, so polyesters cover most architectural, automotive aftermarket, lawn and garden and outdoor furniture work. Standard polyesters are rated for roughly a year of Florida exposure; superdurable grades stretch that to around five.
Run the black polyester on the patio frames, the hybrid's only rated for indoor.
On a quote sheet, polyester with no qualifier means a standard grade; if the job is architectural, ask whether the spec calls for superdurable before pricing it.
Also heard as
- polyester
Related terms
TGIC
Triglycidyl isocyanurate, the classic crosslinker that cures carboxyl polyesters into weather-resistant films.
HAA
Hydroxyalkylamide, the TGIC-free crosslinker used to cure carboxyl polyester powders.
Superdurable
Describing polyester powders built with weather-stable acids that hold gloss and color several times longer outdoors.
Epoxy powder
Powder based on epoxy resin, prized for chemical and corrosion resistance but weak in sunlight.
Urethane polyester
Hydroxyl polyester powder cured with a blocked isocyanate, known for smooth, thin films.