@@nick17342 from what i see with gunpla builders, they usually apply a top coat after painting to protect the paint. i don't know the nature of acylic paint but if it does not leak to your hands when handling then i don't think its necessary.
@@nick17342 Liquitex makes matte or high gloss varnishes you can either paint or airbrush on before or after paint/washes. I get mine from Amazon. Great job on this custom!