How to iron perler beads: heat and time

Medium heat, no steam, paper in between, small circles — until the beads just fuse at their edges.

Set the iron to medium — the cotton mark, no steam, somewhere around 150 °C — and let it come fully up to heat before you go near the beads. An iron that is still climbing gives you a first pass that does nothing and a second that does too much, and by then you are pressing.

Steam is the single most common mistake. It warps the paper, and the paper shifts the beads underneath it while you cannot see them. Empty the reservoir or switch the setting off; if your iron spits when it is cold, run it over an old cloth first.

Lay the paper flat on top and move the iron in small circles for ten to twenty seconds. Do not press. The weight of the iron is already more than enough, and pressing squashes the beads flat and squeezes the holes shut.

Watch through the paper. The beads are rings, and what you are waiting for is the moment the rings close up and the tops just touch each other. When about three quarters of them have closed, stop — the residual heat finishes the rest as it cools.

Melting too far is the mistake with no way back: the holes disappear, the colours go dull and washed out, and the whole piece thins and spreads. A piece that is slightly under-melted can go back under the iron. One that is over-melted is finished.

Let it cool flat, under a book or a chopping board, for a minute or two. If you lift it while it is warm it curls, and once it has curled and set, it stays curled. This is the step people skip and then blame the iron for.

Then turn it over and iron the back, for noticeably less time than the front — the piece is already hot and the second side takes half as long. One side is enough for something that will hang on a wall or a tree; do both for a coaster, a keyring, or anything a child will carry around.

Two details that matter with children: the piece stays hot enough to burn for a good half minute after the iron leaves it, and melting plastic smells. Open a window, and do the ironing yourself even when they have done all the beading.