De or het schoolbordverf?

The correct Dutch article is:

de schoolbordverf

How to use schoolbordverf

the schoolbordverfde schoolbordverf
this schoolbordverfdeze schoolbordverf
that schoolbordverfdie schoolbordverf
our schoolbordverfonze schoolbordverf
your schoolbordverfjouw schoolbordverf
every schoolbordverfelke schoolbordverf
which schoolbordverf?welke schoolbordverf?
a big schoolbordverf / the big schoolbordverfeen grote schoolbordverf, de grote schoolbordverf