Hardware & Building Materials

Distinguish solid walls, hollow walls and other substrates before choosing screws or anchors. A fixing's stated load applies only under its declared material, installation and loading conditions; it is not a promise for every wall. Check diameter, length and screw-to-anchor compatibility, plus corrosion resistance appropriate to the exposure.

• For overhead loads, structural components or an unknown substrate, obtain professional assessment. Do not add anchor capacities as though the load were always shared equally.

An adhesive bonds materials; a sealant may accommodate movement and close joints without being intended to carry loads. Check approved surfaces, primer requirements and moisture and temperature conditions. Distinguish working time, surface drying and full cure. Losing its tack does not mean the product can already withstand the intended use.

Finish affects appearance and cleaning, but the technical information must confirm suitability for the substrate and environment. Check primer and existing-coating compatibility, declared coverage and expected coat count. Coverage also depends on absorption and the colour change. A damp wall or unidentified coating needs investigation rather than concealment under more paint.

Calculate surfaces and joints from actual measurements, allowing a reasonable margin for cuts or losses without treating it as a universal percentage. Large packs make sense only if you can use them within their storage life. Check storage after opening, expiry dates and whether the same finish remains available for touching up.

Use eye protection and gloves compatible with the product, ventilate as labelled and do not improvise chemical mixtures. Avoid sanding suspect materials without qualified assessment. Structural work and interventions affecting installations require professionals. Keep containers labelled and dispose of leftovers according to local instructions rather than pouring them down a drain.