These brush tip paint pens are water-resistant. You will need to bake if used on glass or ceramic or seal with a sealant when used on rock surfaces to make it permanent.

Tips for Glass, ceramic or porcelain curing and baking:Make sure that the surface is thoroughly cleaned, you can use a hair dryer, a space heater, a hot plate, etc., BE CAREFUL !

Safe and reliable: Designed with quality rich water-based inks, these skin tone markers are with high color purity and strong hiding power, safe and reliable to use, waterproof, and not easy to fade, which can be washed off from skin and most washable clothes.

SAFE, NON-TOXIC, VIVID: ASTM D-4236 certified watercolor markers are non-toxic, odorless and water-based. They are waterproof, sun proof, leak proof and dry quickly. The acrylic markers wont fade over time. Better yet, the acrylic highlighter glides smoothly without smudging.

Versatile markers: Water-based painting marker can not only be applied on faces, bodies or hair, also you can use it to draw beautiful patterns on tiles, rocks, canvas, glass, wood, metal, fabric, porcelain, cardboard, paper, and most solid surface.

Ideal tip: paint marker pens with 0.7mm/2-3mm tip are ideal choice for your smears, DIY projects or artistic work, smooth in writing, easy to dry and wont leak water, which can blend well to add eye-catching effect to your work.