Most kids can’t wait to dive into a good craft session over the summer holidays. But parents and carers often find themselves dealing with a mess that goes beyond the usual sticky fingers and glitter trails. That’s because the heat doesn’t just warm up the room, it changes how art supplies behave.

We’ve seen it happen too often. Glue that won’t hold. Foam that curls. Markers that dry up after one go. The truth is, many kids craft supplies don’t handle extreme heat well. And as we head into the hottest weeks of the year, it helps to know which materials are more likely to fall apart, and why. This guide explains what summer conditions can do to common craft gear and what you can do to prepare for it.

What Heat Really Does to Art Materials

Hot weather puts extra stress on craft materials, especially the softer or stickier ones. Many adhesives have a short shelf life when temperatures climb. That includes kids' favourites like glue sticks and white craft glue, which can start separating or drying out inside their tubes or bottles.

Thick glue may turn stringy or rubbery, making it harder to spread. Sometimes it stops sticking altogether. We’ve even seen sticky tape lose its grip after just minutes on a hot surface. Plastics can also soften, warp, or make colours bleed. That’s especially true if they sit in a sunny spot or inside a hot car for more than a few hours.

Markers and felt tips suffer too. Heat makes the ink evaporate faster, which means they might skip, dry mid-line, or simply run out quicker than normal. Some paints can thicken unevenly, turning dull or lumpy, especially if lids aren’t sealed properly.

Here are a few signs heat is at work:

• Glue that used to be smooth and sticky now looks chunky or watery
• Plastic containers have slight dents or softened edges from storage
• Marker caps feel loose and the ink fades more quickly

Not all materials react the same way, and some are more forgiving than others. But once heat takes hold, even the best brand can behave differently.

Why Some Supplies Seem Fine at First

Sometimes these materials look fine when you pull them out of the cupboard. But give them ten minutes at the kids’ table in a warm room, and suddenly things are falling apart. That’s because initial appearance doesn’t always show what’s happening inside a bottle or packet.

Most kids craft supplies are packed for neutral storage, not for long days above 30 degrees. Temperature swings between air conditioning and full sun can speed up wear inside sealed items. And packaging isn’t always enough to protect what’s inside once it hits shelf age plus heat.

Humidity adds another layer of trouble. It makes paper wrinkle or stick. It can soften foam sheets or loosen labels. If the windows are open, breezes can leave dust and moisture across drying paint or glue, slowing the process or warping the surface.

Sun exposure finishes off the lot. If painted or glued items are left near windowsills, they might start curling at the corners, fading, or even falling apart within a few hours.

Keep this in mind when thinking about workspace setups:

• Even shady spots can hold heat over time
• Opening and closing windows plays with humidity levels
• Damp morning air followed by dry afternoons can affect drying speeds and results

Common Craft Materials That Struggle in Heat

Some supplies just don’t hold up well once the weather reaches the mid-thirties. We often see glue sticks go dry, crumble, or lose tack after only a few minutes in the sun. Foam sheets start to lift around the edges or shift if they’re under pressure. Pom poms sometimes flatten during storage, and sticky eyes fall off just as the glue dries.

Watch out for these issues:

• Adhesive failing on plastic items like googly eyes or stickers
• Foam shapes lifting at the corners or warping slightly
• Marker colours going lighter or looking blotchy
• Glue dots or pre-stick materials not holding where they should

Some quick changes to how you prep the space can reduce mess. A shaded table away from open windows, cool tile surfaces, or hard drawing boards can slow the heat effects. And it’s always a good habit to test small amounts before rolling out full projects. For younger children, we stock Micador Early Start Sofites Tri-grip Crayons, ideal for 2 to 4 year olds, with vibrant pigments and smooth binders that give even colour laydown in a reusable plastic case, which helps them get satisfying results from simple projects.

What to Look For (and Avoid) During Summer Stock-Ups

Before restocking your kids' art box, it helps to think ahead. Not all craft items are made for Aussie summer days. Even if they’re listed as “child-safe” or “non-toxic,” they might not hold up in 35-degree heat sitting in the boot of the car.

Here are a few things we check for:

• Is the glue thick and smooth? Avoid bottles that feel hard or separated inside the container
• Can the material handle a quick press without denting or warping? Check foam sheets and pom poms especially
• Are the lids snapping on tight? Loose lids lead to dry-out, especially for markers and paintbrush pens

Labels can be helpful too. If packaging lists a “store below 25°C” notice, that is worth paying attention to. These supplies will need a cupboard or drawer indoors, not a hot room or pantry shelf.

If you’re planning several projects back to back, try keeping some materials in containers placed on tiled floors or cool timber shelves. The cooler base gives them a bit longer before heat builds up and changes the texture. Washable choices such as Micador Early Start Washable Oil Pastels use high quality pigments and smooth binders for colour and can be washed off walls, which is handy when bigger projects spread beyond the page.

A Little Prep Goes a Long Way in Summer Sessions

Crafting with kids should be about fun, not frustration. But with January heat in full swing, it’s smart to check supplies before that first drop of glue hits the paper.

Look at lids, give bottles a shake, test markers on a scrap, and try adhesives on a corner bit of card. A few minutes of prep means fewer surprises halfway through the activity. Less peeling, slipping, and drying patches make for much smoother sessions, even on hot days.

Most importantly, knowing how materials act in summer means you can plan better craft days indoors. When we pay attention to how heat affects each tool or surface, we can keep the frustration low and the focus on creative fun.

We know how tricky summer crafting can get, especially when favourite materials start misbehaving in the heat. If you're planning ahead for holiday art sessions, it helps to have the right setup and choose supplies that hold up indoors. Our collection of kids craft supplies includes tools and materials that suit creative hands and warm Aussie days. At Art Supplies Castlemaine, we’re happy to help you figure out what will work best for your space and sessions. Give us a ring or pop in with any questions.