Do you think they will work well on rocks??

I bought these to use on rocks, smooth rocks. They worked good, but when I coated with clear nail polish-as I usually do with regular paints, everything melted and ran. I'm so disappointed. I'll try a regular spray sealer next, but I've always had better luck and a glossier finish when sealing with just regular nail polish-until now. . .

Would these work on a plastic cooler?

I suggest you sand the cooler to get a more rough surface then color over it

What are all the colors included in this? Is the color gray included? How thick/ wide is the line? I am looking for .7mm

Included colors are:Navy Blue, Light Blue, Purple, Forest Green, Light Green, Pink, Red, Yellow, White, Grey, Black, Orange, Light Orange and an Orange Cream color. Line is .9 ~ 1.3mm. The thinnest I've found in actual "paint" markers.

Is this good for painting glasses? Can you bake it on like acrylic paint?

Yes they will write on glass. I have used them on wine bottles. I also use them on canvas and rocks. Not sure about the baking part, never tried that.

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🎨 Elevate your mark with every stroke—because ordinary just won’t do.

COMPACT PORTABLE - Lightweight 8.5 oz set fits perfectly in your creative toolkit or office drawer.
PRECISION MEETS STYLE - Fine 1.3mm tip for detailed, professional-grade artwork and notes.
ECO FRIENDLY EXPRESSION - Water-based pigment ink that's safe, vibrant, and long-lasting.
UNLEASH YOUR CREATIVITY - 15 vivid, fade-resistant colors to make your ideas pop.
VERSATILE SURFACE MASTERY - Writes smoothly on glass, metal, plastic, and more—perfect for every project.

The Uni-Ball Uni POSCA PC-3M 15-piece set features 15 vibrant, water-based pigment colors with a precise 1.3mm fine round tip. Lightweight and compact, these markers deliver professional-quality, fade-resistant ink that works seamlessly on multiple surfaces including glass, metal, and plastic—ideal for creative professionals and managers who demand both style and substance.

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€ 47.58

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Brand	posca
Model Number	PC-3M15C
Color	Set of 15 colors
Material Type	glass Metal Plastic
Number of Items	1
Size	Fine point
Point Type	Fine
Line Size	1.3 ミリメートル
Ink Color	Set
Product Dimensions	14.99 x 5.59 x 7.62 cm; 235.87 g
Shredded Shape	Water-based Pen

Uni-Ball uni POSCA PC-3M, 15 pcs

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