Glass Paints

Glass paints in this category are squeeze-bottle vitreous colors made for kiln-fired glass work. The selection is built around Bullseye's Color Line system: ready-to-use paint pens in a broad spectrum of colors, the Color Line Basic set with tip sets, plus mixing mediums, flux, and refillable bottles for custom blends. The category also includes Glassline fusing paints and metallics, as well as tip sets compatible with both brands.

What Color Line glass paints are

Color Line is a vitreous glass paint that bonds to Bullseye glass in the kiln. Each color ships in a 2.2 oz squeeze bottle with a fine tip, so you can draw, dot, write, and outline directly on sheet glass without a brush. Once fired correctly, the color becomes a fired-on glass color layer suited to kiln-formed work.

Colors and sets

The palette spans warm tones like red, lacquer red, carmine, coral, orange, bright orange, peach cream, mustard, and sienna; greens including sea green, lime green, moss green, mineral green, and hunting green; blues such as cobalt, royal, deep sky, midnight, Egyptian, and aquamarine; purples like lilac, dark lilac, eggplant, and maroon; and neutrals including black, grey, icy grey, brown, gold, bronze, and copper. The Color Line Basic set is a good starting point because it bundles a working palette with tip sets, while individual pens let you fill gaps in your existing range.

Mediums, flux, and refills

Airbrush Medium thins the paint for spray application, and Color Line Flux is a clear medium that helps colors flow and bond at fusing temperatures. Empty bottles let you mix custom colors and keep them ready to dispense, and replacement tip sets keep your lines crisp as nozzles wear.

COE compatibility and firing

Color Line is formulated to fire with Bullseye 90 COE glass. Apply to clean, oil-free glass, let the paint dry fully, then fire in a standard kiln schedule with the glass it decorates. The paint matures during a fusing or tack-fuse cycle, so test fires on scrap are worthwhile when stacking layers, combining with frit, or pairing with other surface treatments.

Uses and applications

Reach for Color Line when you want line drawing, lettering, fine detail, dots and pattern work, signatures on the back of fused pieces, or color accents on jewelry, plates, tiles, bowls, and panels. Finished work is more durable than unfired surface decoration, but test when refiring, layering, or combining Color Line with other surface treatments.