I made 3 surfboards from 6mm foam. Measurements are:
10 cm high
2.5 cm across
I used acrylic paint and a blade to cut them (scissors will cut uneven). One coat of acrylic paint wasn't enough for the foam to absorb; three worked.
I used a heat gun to smooth out any rough edges around the sides
Shall we beat this horse a little more.
I'm not even sure where lacquers come into play. Then there's water based acrylic and lacquer based. How do you tell?