AT 304

Substrate type
Base plaster, precast concrete walls and ceilings and poured in boarding systems, as well as walls made of silicate and cellular concrete block walls with narrow gaps.

Substrate preparation
The substrate must be clean, sound, dry and free from dirt, dust and grease. Weak surfaces should be primed with ALPOL AG 700 deep-penetrating primer, whereas highly absorbing surfaces with APOL AG 708 or AG 709 deep-penetrating primer. On smooth surfaces of precast concrete and poured in boarding systems use ALPOL AG 702 primer to create a bonding layer. During application of the finishing layer (screed) on freshly applied base plater coatings e.g. ALPOL AT 300, AT 301, AT 306, allow at least a 7-day interval per each centimetre of base plaster coat thickness, and moisten the base plaster with copious amount of water immediately prior to the screed application. Points susceptible to cracking, e.g. at interfaces of different construction materials and corners of openings, should be strengthened with fibre glass reinforcing mesh size at least 8x8 mm, by embedding it in ALPOL AZ 130 quick-setting or ALPOL AZ 135 levelling mortar or in the plaster.

Instructions for use
Use the plaster unit with to apply the plaster onto the entire area to be treated during one working cycle. The plaster should be applied in two stages. To begin with: apply the plaster on the substrate, skim with a feather edge (H-type darby), patch any possible chipped areas and level out the entire surface. Leave the surface treated that way for around 2-6 hours (depending on substrate absorption, weather conditions and plaster coat thickness) until initial plaster setting takes place. The works can be resumed only when the plaster has set enough so that it becomes “dusty” when skimming with the darby is continued, and too fresh material is not “torn” out of the surface. When resuming the work too late, the plaster will have set too much which will make it difficult to process the plaster, require more work and might make it impossible to achieve the right finish. In the second stage, smooth out the entire surface carefully by cutting off the excess of plaster with a trapezoidal darby. Then sprinkle the levelled surface with water and finish the surface with a polystyrene float. To achieve fine structure, finish the plaster with a dry float with fine and soft sponge or with a felt lining. Use a power trowel to get an ideally smooth and even finish.

Tools
Plaster unit, power trowel, floats and darbies, trowel, bubble level, container for mortar.

Working conditions
Work in ambient temperatures between +5°C and +25°C. Do not add any other agents. Protect fresh plasterwork from excessive drying and moisture. Do not use electrical heaters (risk of shrinkage cracking) and gas heaters (shrinkage and carbonation processes).

Storage
Store in original, unopened packages in dry place – shelf life 12 months from production date. Protect from moisture during transport and storage.

Notes
The specifications and instructions for use are based on the temperature (20±2)°C and relative air humidity (65±5)%. The workability may vary in different conditions. Irritating to eyes, respiratory system and skin. Appropriate eye, respiratory and skin protection measures should be used. Becomes alkaline after mixing with water. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Keep away from children. Use water to remove fresh dirt or ALPOL AI 770 cleaner to remove hardened dirt. The manufacturer assumes no liability for damage resulting from improper or inappropriate use of the product.

General recommendations
Work according to building practice, observing health & safety standards and regulations.

 * for machine-application – establish experimentally for each type of a plaster unit

Declaration of conformity has been issued for the product.
Reference document: EN 998-1.
The product has been approved by the National Institute of Hygiene (PZH).
The Polish Classification of Goods and Services (PKWiU): 23.64.10.0.
Water-soluble chromium (VI) content below 2 ppm.
Fidor, 2021-06-01. The present product sheet is valid and supersedes all previous issues.