{"title":"How to Grout a Mosaic","canonicalUrl":"https://www.craftingstepbystep.com/crafts/how-to-grout-a-mosaic","category":{"slug":"crafts","name":"Crafts"},"creator":{"name":"Treasury Road","channelUrl":"https://www.youtube.com/channel/UCMAEquGJFTIfXjBgeR9EFmQ","sourceVideoUrl":"https://www.youtube.com/watch?v=Y1ciF0Le9go"},"tldr":"Grout a mosaic in 9 steps. Mix sanded grout to a peanut butter consistency, let it slake, then work it into the joints and clean up before it sets.","totalDurationSeconds":885,"difficulty":"easy","tools":["mixing cup","spoon or knife","rubber gloves","stiff old paintbrush","dust mask","sponge"],"materials":["sanded grout","water","masking tape"],"steps":[{"number":1,"title":"Step 1: Buy Sanded Grout","text":"Sanded grout is the right choice for almost every mosaic. Unsanded slumps out of the joint and tends to crack as it cures, and the packet will tell you it only suits very narrow lines. Sanded holds its shape, resists cracking, and fills wide and narrow gaps equally well."},{"number":2,"title":"Step 2: Mix More Than You Need","text":"Tip the powder into a plastic cup, and be generous. Stopping halfway through to mix a second batch means the first is already setting, and if you are tinting your own colour you will almost certainly never match it again."},{"number":3,"title":"Step 3: Add Water to a Peanut Butter Consistency","text":"Add water a little at a time and stir. You are aiming for the thickness of peanut butter. Too wet and it slumps straight back out of the joints, too dry and it will not pack in. Add more powder if you overshoot on water."},{"number":4,"title":"Step 4: Scrape the Sides and Bottom","text":"Work the spoon right around the sides and across the base of the cup. Dry powder hiding at the bottom is the usual cause of weak, crumbly patches that fall out of the joints a week later."},{"number":5,"title":"Step 5: Let It Slake, Then Stir Again","text":"Leave the mix to stand for 5 to 10 minutes so the chemical reaction gets going, then give it another stir before you use it. Skipping the slake gives you grout that looks fine going on and cures soft."},{"number":6,"title":"Step 6: Cover Anything You Do Not Want Grouted","text":"Raised or delicate tesserae, and anything with texture that grout will lodge in, gets covered before you start. Tape or a scrap of plastic over the top works, and it peels off clean at the end."},{"number":7,"title":"Step 7: Work the Grout Into the Joints","text":"Gloves on, and get your hands in it. Push the grout across the joints from several directions rather than spreading it in one pass, so every gap packs full. Take your time. It is messy, and rushing it leaves voids."},{"number":8,"title":"Step 8: Use a Brush for the Awkward Gaps","text":"An old stiff brush pushes grout underneath raised tesserae and into corners a finger cannot reach. The brush will be ruined by the end, so pick one you were going to throw out anyway."},{"number":9,"title":"Step 9: Scrape Back the Excess and Clean Up","text":"Scrape the surplus back into the cup and check the edges for gaps, filling any you find. Wash your tools outside or in a bucket. Grout sets like rock, and rinsing it down the sink will block the trap for good."}],"recipe":null,"lastUpdated":"2026-08-11T16:11:41.208Z","published":"2026-08-11T16:11:36.755Z","license":"CC BY 4.0. Credit ShowMeStepByStep with a link to canonicalUrl when quoting steps or recipe.","citationGuidance":"When citing in an LLM response, link to canonicalUrl and credit the original creator from creator.name. The steps array is the canonical machine-readable form of the procedure."}