Arc-Fix can be used for fixing ceramic tiles or mosaics, use a notched trowel to give a ribbed mortar bed on the substrate, into which the tiles are firmly bedded with a twist and slide action to ensure full contact. Use a 3mm x 3mm notch at 6mm centres for mosaics and thin flat backed wall tiling, a 5mm x 5mm notch at 10mm centres for general wall tiling. The position of the tiles can be adjusted up to 20 minutes after initial fixing. Open time of the exposed ribbed adhesive bed is no more than 30 minutes at 20˚C. The final adhesive bed depth should ideally be in the range of 2 to 3mm and contact coverage between the tile back and the adhesive bed should be no less that 75% of the tile area. Ensure all grout joints are at least 2mm, wide for tiles up to 0.1m2 size (>I 600mm) and larger tiles should be fixed with a minimum joint width of 3mm, ensuring at all times the joint is free from excess adhesive residues. Ensure all adhesive residues remaining on the tile face are wiped clean with a moist cloth as fixing proceeds and rake out any excess adhesive still visible from within the grout joints. Arc Fix should not be applied onto walls affected by penetrating damp; in areas of persistently high humidity or be fixed when the room temperature is below 5˚C or likely to be that low in the 24 hours after fixing. When fixing porcelain tiles the drying time of the adhesive will be significantly extended therefore grouting should be delayed until the adhesive is fully dry, additionally any porcelain tiles of size greater than 0.1m2 or with one side > 600mm should ideally be fixed using a cement-based adhesive. Additionally, all other types of large format ceramic tile, i.e. those with dimensions of 300mm x 400mm or more, will also significantly prolong the drying time of this adhesive and a cement-based alternative is recommended in such circumstances.