Mosaic is one of the oldest and most accessible crafts — arranging small pieces of material (tesserae) into patterns and images on a surface. The basic technique has not changed in thousands of years: stick tiles to a surface, fill the gaps with grout, and clean up. With a few materials and a free afternoon, you can create everything from a simple coaster to a full table top.
Materials
Mosaic tesserae come in glass, ceramic, stone, shell, mirror and acrylic. Glass and acrylic mosaic tiles are the most popular for beginners — they are available in a wide range of colours, are easy to cut and nip to shape, and look beautiful both indoors and out. Ceramic tiles are harder and more durable but more difficult to cut precisely. Natural stone gives an earthy, organic look.
For the base surface, you need something rigid and stable. MDF, plywood (exterior grade if the piece will be used outdoors), cement board, terracotta pots and old furniture all work well. Avoid surfaces that flex or expand significantly with moisture — the grout will crack and tiles will pop off.
For adhesive, PVA glue works for indoor pieces. For outdoor or wet-area mosaics, use a flexible tile adhesive or an outdoor-rated craft adhesive. For the grout, standard unsanded tile grout works for gaps up to 3mm; sanded grout is better for wider gaps. Grout is available in many colours — dark grout (grey, black, charcoal) makes the colours of the tiles pop, while white grout gives a cleaner, brighter look.
Design
Start simple. A geometric pattern or a simple image with clear outlines is much easier than a detailed, flowing design. Sketch your design on paper first at full size, then transfer the outlines to your base surface with a pencil. For beginners, working within a border or frame simplifies the layout — fill the border first, then work inward.
Lay out your tiles dry (without glue) on the design first. This lets you adjust colours, spacing and placement before committing. Aim for consistent spacing between tiles — 2-3mm gaps look clean and are easy to grout. Very tight gaps are difficult to fill; very wide gaps waste grout and weaken the overall surface.
Cutting tiles
Mosaic nippers (tile nippers) are the essential cutting tool. They work by applying pressure to crack the tile along a controlled line. Hold the tile with about a third of its width between the nipper jaws and squeeze firmly — the tile snaps along a line roughly where the jaw edges meet. Practice on scrap tiles before working on your project. The cuts will not be perfectly straight — this is normal and part of the mosaic aesthetic.
For more precise cuts, a wheeled tile scorer and breaker gives cleaner lines. For complex shapes, score the cut line first with a glass cutter, then nip away the waste in small bites. Always wear safety glasses when cutting tiles — small shards fly unpredictably.
Laying
Apply adhesive to the base surface (not the tile) with a small brush or spatula, working in small sections. Press each tile firmly into the adhesive with a slight twist to ensure full contact. Work from the centre of the design outward, or from one edge to the other — whatever method keeps your spacing consistent. Wipe away any adhesive that squeezes up between tiles before it sets.
Let the adhesive cure completely before grouting — at least 24 hours for PVA, longer for tile adhesive in cold conditions.
Grouting
Mix the grout to a thick, creamy consistency (like peanut butter). Spread it over the entire mosaic surface with a rubber grout float or a gloved hand, working it into every gap between the tiles. Press firmly to ensure the grout fills completely — air pockets under the surface will crumble later.
Let the grout set for 15-20 minutes until it starts to firm up but has not fully hardened, then wipe the excess off the tile surfaces with a damp sponge. Rinse the sponge frequently and wipe gently — too much pressure pulls grout out of the gaps. A second pass with a clean, barely damp sponge removes the haze. Let the grout cure for 24 hours before handling.
Sealing
For outdoor mosaics and pieces that will be exposed to moisture, seal the grout with a penetrating grout sealer once it has fully cured. This prevents water absorption, staining and frost damage. Indoor pieces on display generally do not need sealing, but kitchen and bathroom mosaics benefit from it.
