Coasters defend against two different threats and most people only think about one. Printed coasters are excellent against the first and unreliable against the second.

Condensation: solved

A cold drink sweats, water pools under the glass, and on a wooden table that becomes a white ring within an hour. Printed plastic is completely unaffected by this and stops the water reaching the wood. For iced drinks, beer, water glasses and anything from the fridge, a printed coaster does its job perfectly.

Heat: be careful

Here is the part nobody mentions. Standard printing materials soften around 55-60°C. A freshly poured mug of tea is hotter than that. A thin printed coaster under a very hot mug can soften enough to deform or, worse, transfer heat to the surface below it.

In practice, a mug that has sat for two or three minutes is fine, and a thick coaster is far more forgiving than a thin one. But if the household habit is straight-from-the-kettle onto the table, use cork or ceramic for hot drinks and keep the printed set for cold ones. We would rather tell you that than sell you a set that warps.

Patterned versus solid

Open patterns – leaf shapes, lattices, honeycomb – look considerably better and let condensation run through to the surface below. They are display pieces that tolerate a glass. Solid-top designs are the ones that actually keep water off the table. Decide which job matters more before choosing on looks.

Grip

A smooth coaster on a smooth table slides, and a glass that slides with it eventually goes over. Look for a textured underside, or add small felt pads – a fifty-cent fix that also protects against scratching.

Sets and holders

Coasters are the most-lost object in any home. A set that comes with a holder survives because they have somewhere to return to. Individual coasters end up under the sofa within a month.

Cleaning

Warm soapy water, soft cloth. Never the dishwasher – the heat is the problem, not the water. Wine and coffee can stain lighter colours, so mid-tones and darker shades age better if the set will see real use.