Maker Questions Made Clear
When a DIY transformation fails, it is almost never because the maker lacked artistic talent—it is because a silicone residue blocked primer adhesion, or a water-based coat reactivated wood tannins. Here are straightforward answers to the ten questions we receive most often.
1. Why does my paint scratch off glass jars and glazed ceramics even after two days of drying?
Touch-dry is not the same as cured. Water-based emulsion and acrylic paints dry to the touch in an hour as water evaporates, but their polymer particles take 5 to 14 days to fully coalesce. Furthermore, on slick soda-lime glass, water-based paint has no pores to grip. Always wipe the glass with 99% isopropyl alcohol and apply one thin coat of shellac-based adhesion primer before stippling your mineral texture mix.
2. How do I stop yellow-brown blotches from bleeding through pale blush paint on old pine or mahogany?
Those amber rings are water-soluble tannins and pine resins drawn to the surface as your water-based paint dries. Sanding them back and adding more emulsion will only pull up fresh tannin. Seal the bare timber knots first with two thin coats of shellac knotting solution or an alcohol-based stain-blocking primer.
3. Can I put water and fresh flowers inside a mineral-coated or paper-pulp vessel?
For glass jars and metal tins, keep all mineral slurry and cork wraps strictly on the outside; the untouched glass interior holds water indefinitely (line metal tins with a removable glass jar to prevent rust). For sculptural paper-pulp bowls or turned wooden totems, conceal a narrow glass test tube or tall caper jar inside the opening whenever displaying fresh stems.
4. Are upcycled fabric or pleated-paper lampshades safe from overheating?
Yes, provided you follow two strict rules: maintain at least 60mm of air clearance between the bulb envelope and the shade wall, and install only modern LED bulbs rated at 4W to 6W maximum. A 5W LED produces negligible radiant heat compared to old 60W tungsten bulbs. For peace of mind, mist paper and linen shades with a clear organic flame-retardant spray meeting BS 5867 standards.
5. How do I remove stubborn waterproof labels and sticky glue from bottles without toxic solvents?
First peel off the top paper layer after soaking in hot water and washing soda. Mix equal parts baking soda and olive or rapeseed oil into a gritty paste, rub it over the sticky synthetic gum, and let it sit for 20 minutes. The oil breaks down the polyisobutylene tackifier while the soda acts as a gentle mechanical scrub. Wash off with warm dish soap.
6. Can I paint or oil furniture indoors in a small flat without strong fumes?
Absolutely. Powdered casein milk paint, clay-based chalk paints, and raw hemp seed oil contain zero volatile organic compounds (VOCs) and have only a faint, pleasant herbal scent. If you need a high-grip primer for melamine, choose a low-odour waterborne urethane acrylic primer rather than solvent-based shellac when working in unventilated rooms.
7. Why did my homemade calcium carbonate chalk paint crack like a dry riverbed?
Mud-cracking (craquelure) happens when the ratio of dry mineral filler to liquid acrylic binder exceeds roughly 1:2 by volume, or when a very thick coat is dried rapidly with a hairdryer. Keep your whiting powder at 25% to 30% of the paint volume, and build texture in two thin stippled layers rather than one heavy slab.
8. Are upcycled painted plates or bowls safe for serving food?
No decorative paint, varnish, or craft resin is tested to withstand knife cuts or hot acidic foods. If you transform a ceramic platter or wooden bowl using pigments or pulp, use it exclusively for dry packaged goods, wrapped fruit with inedible skins (such as oranges or walnuts in the shell), or keys and jewellery.
9. How do I drill or cut holes in tin cans and thin brass without tearing jagged edges?
Fill a clean steel food tin with water and freeze it solid overnight before drilling or punching holes for lamp ventilation or leather handles. The solid ice core supports the thin metal wall from the inside, preventing dents and reducing burrs. Deburr any sharp inner rim with a half-round needle file.
10. What is the single smallest tool kit a beginner needs for these courses?
You can complete 90% of our curriculum with six humble tools: a 38mm synthetic oval brush, a stiff hog-bristle stippling brush, a retractable metal utility knife with fresh snap-off blades, a 300mm stainless steel cork-backed ruler, a hand sanding block with 120- and 240-grit paper, and a pair of combination pliers.