I've used acrylic paint on every tank I have had without any problems at all, I have used a brush as well. All you need to do is apply it then wait for it to dry (a fan will help) it doesn't take too long then apply another coat. I usually apply 5 coats and only takes about 6 hours until finished. I have some spare acrylic stuff here if you want it adrienne, I can bring it around on Wednesday.