AT 304

Substrate type
Walls made of bricks and silicate blocks, cellular concrete blocks, as well as walls and ceilings made of prefabricated concrete components. Old, not weathered cement-lime plaster. ALPOL plasters applied in terms of underlay (base) plasters.

Substrate preparation
The substrate made of prefabricated concrete and formwork systems must be even, dry, sound, clean, as well as free from dust and grease. To make a bonding layer, prime the substrate with ALPOL AG 702 primer. Remove paint from old and durable plasters, patch irregularities and chipped plaster with ALPOL AZ 130 quick-setting mortar or ALPOL AZ 135 levelling mortar. Before application of ALPOL AT 304 on fresh traditional cement-lime plasters (such as ALPOL AT 300, ALPOL AT 301, ALPOL AT 303) allow at least 7-day break per 1 centimetre of the plaster thickness. Then, prime with ALPOL AG 702 primer or moisten with plenty of water. Walls made of cellular concrete as well as of silicate bricks and blocks require neither priming nor an initial scratch coat. Before plaster application moisten the walls with plenty of water. Surfaces exposed to scratching, e.g. adjacent structural material, corners of door/window openings etc., should be strengthened with 10 mm fibre-glass reinforcing mesh, by embedding it in ALPOL AZ 130 quick-setting mortar or ALPOL AZ 135 levelling mortar.

Instructions for use
Use available plaster units with a single mixing chamber to apply the plaster onto the entire area to be treated during one working cycle. After application, carefully remove excess plaster with H-type darby, patch holes if any, and trowel the entire surface with a darby. Leave surface treated that way for around 1-2 hours (depending on substrate absorption, temperature, air humidity) until initial plaster setting takes place. The plaster should be set enough so that fresh plaster is not scraped but abraded with another pass of the darby. Smooth the entire area with a trapezoid floating rule again, spray the plaster with water and trowel with a Styrofoam float or, if hard enough, with a rough plastering sponge. To achieve fine structure, finish the plaster with the use of dry float with fine and soft sponge or felt. 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 +30°C. Do not add any other agents. Protect fresh plasterwork from excessive drying and moisture. Do not use electrical heaters (to avoid shrinkage cracks) or gas heaters (to avoid shrinkage and carbonisation process.)

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 given for the temperature of (20±2)°C and relative air humidity of (65±5)%. The workability may alter in different conditions. Irritating to eyes and respiratory system. Appropriate eye, respiratory system 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 accepts no responsibility for damage caused by unskilful 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: PN-EN 998-1:2010.
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, 2010-05-04. The present product sheet is valid and supersedes all previous issues.