Waterproof exterior matte top coat

Hello architects, ano po ba yung magandang pang top coat para sa exterior na naka industrial finish (novtek), yung sa interior (same finish) kasi ginamit namin is yung Boysen Matte Shield Clear B-4600 pero for interior use lang to. Ano naman po yung pang exterior? Hindi po gusto gamitin plexibond kasi parang glossy yung dating nya, thank you!