Filiform corrosion resistant polyester/acrylic hybrid coating composition

A powder coating composition, comprising:

• an epoxy functional acrylic polymer present in an amount of from 5 weight % to 53 weight %, based on total resin solids in the powder coating composition;
• a hydroxyl functional polyester polymer comprising a first hydroxyl functional polyester polymer having an acid value of up to 10 and a weight average molecular weight of up to 20,000 g/mol, present in an amount of from 15 weight % to 86 weight %, based on the total resin solids in the powder coating composition, and a second hydroxyl functional polyester polymer having a hydroxyl value greater than a hydroxyl value of the first hydroxyl functional polyester polymer present in an amount of from 3 weight % to 40 weight %, based on the total resin solids in the powder coating composition;
• an acid functional crosslinker present in an amount of from 2 weight % to 30 weight %, based on the total resin solids in the powder coating composition;
• and
• a blocked polyisocyanate crosslinker comprising a uretdione, present in an amount of from 1 weight % to 55 weight %, based on the total resin solids in the powder coating composition,
• wherein the powder coating composition comprises at least 65 weight % of a combined total of the hydroxyl functional polyester polymer and the blocked polyisocyanate crosslinker, based on the total resin solids in the powder coating composition.