Have not use synthetic (dulux) in 35 years.Shines great for 6 months runs like mad and then turns to chalk. Acrylic (centari) with hardener will shine good , will not run as easy but will run. turns to chalk in 18 to 24 months.
Synthetic is like the old brushing enamel. Tractor and implement, barn paint, etc. Synthetic never really hardens thruout, stays soft below the surface. Most of the synthetics chalk as the surface pigments die. Good for undercarriage, underside paints. Economical, somewhat durable resists chipping.
Acrylic enamel has a more complicated base and has different additives added to make it tougher/harder and more durable. Tho being harder, it tends to chip if impacted. Has good gloss and shine but it can be re-coat sensitive ( craze, lift, mottle) as the paint changes chemically when it sets up and surface hardens. Either paint all coats in one session or wait weeks for next coat to be safe to apply.
Hardners tend to improve handling and spray ability of both products.
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