Craft sealant for children’s art: Hasi Diamond Painting Coating Agent
In short
Hasi Diamond Painting Coating Agent is a water-based craft sealant used at home in Korea to preserve children’s artwork. I applied it thinly to a foam-clay music box; once dry, the sparkle looked clearer and the beads felt smoothly secured. Verdict: a satisfying large-capacity coating agent for keeping children’s creations longer.

Good to know
- Volume
- 247ml
- Included
- Silicone brush
- Product feature
- Described as water-based PVA
Prices as written by the tester on Sep 5, 2025 · not updated automatically
When you’re raising a child, all kinds of creations pile up around the house, right? Especially the diamond-painting pieces Hosoon brings home every week from art class—they’re sparkly and pretty, but when they sit at home, beads quickly fall off or dust sticks to them and dulls the shine. And Hosoon is the type who really cares about a finished piece, so she can’t stand even the tiniest flaw 😂

So the Hasi Diamond Painting Coating Agent I got to try this time was exactly what our home needed: a generous 247ml bottle with a brush included!
Unboxing the Hasi Diamond Painting Coating Agent



As soon as I opened the box, I thought, “Oh, it’s bigger than I expected!” At 247ml, it seemed like it would last a long time, and the silicone brush included alongside it immediately caught my eye.

I liked that it didn’t just come with the liquid—the brush was included too, so there was no hassle of preparing one separately. I also remembered using something called varnish in art class years ago, so I worried it might have a strong smell. But when I opened it, I was surprised that this water-based product was almost odorless. Hosoon has severe atopic dermatitis, so we never use products with harsh smells, but this felt completely comfortable to use together with a child.
The cap was a little confusing to open



At first, I fumbled around for a moment trying to work out how to open it. You don’t twist off the whole cap; you lightly twist the top section to open a small hole, then squeeze the liquid out through it. At first I was thinking, “Why isn’t it coming out?” but once I understood the design, it was much easier. It lets you control the amount freely, and nothing spills or overflows onto the floor, so it stays nice and neat.
Results after applying it directly to a foam-clay music box


I used the brush to spread a thin layer of the coating agent over the foam-clay music box Hosoon made.

Because it was a clear liquid while I applied it, I briefly worried, “Huh? Is the piece going to turn cloudy?” 😂 But once it dried, a clear coating layer settled into place. The sparkle on top became much more distinct, and every little foam bead was smoothly secured, making the finished piece look so much better.
Best of all, it wasn’t sticky after drying and hardened firmly, so it felt secure even when touched. Thanks to the Hasi coating agent, I felt very satisfied that it would stay sturdy even when stored for a long time.
What reassured me when using it with my child
Whenever I do something at home with my child, I’m the kind of person who first thinks, “Is it safe?” Glosses and adhesives can often cause headaches because of their smell or irritate the skin on contact. But Hasi Diamond Painting Coating Agent is water-based PVA, so it has almost no smell and is said to be usable without concerns about environmental hormones. That was what I liked most.


These details really matter when you’re making things with children. It affects the air in the home, and there are many chances for little hands to touch it. This product has a clear eco-friendly point, so I think I’ll keep using it.
A sparkling time with Hosoon
As Hosoon applied the coating agent to her piece, she said, “Mom, now this will stay sparkly for a long time!” It was so cute to see how proud she was that she could treasure and preserve her own creation for longer. I think it gave her a chance to think not only about making something, but also about how to keep it prettier and preserve it for longer.

Why I recommend this large-capacity craft sealant
- The generous 247ml size was great for using plenty of it.
- The included brush meant it was ready to use right away.
- As an eco-friendly water-based product, it felt less burdensome to use with a child.

It is said to be useful not only for diamond paintings but also for photos, paper, wooden accessories, and many other creations, so I think families with lots of creative activities will definitely be satisfied. I especially want to recommend it to anyone who has lots of children’s art around the house, like we do ✨
Hasi Diamond Painting Coating Agent was an eco-friendly, reassuring large-capacity sealant that keeps children’s artwork sparkling for a long time!
Where to buy
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