Substrate preparation

Careful surface preparation is very important for optimum finish and durability.

1. The surface needs to be clean, dry, sound and free of any contamination that may harmfully affect the adhesion of the membrane.
2. Maximum substrate moisture content should not exceed 5%.
3. New concrete structures need to dry for at least 28 days.
4. Old, loose coatings, dirt, fats, oils, organic substances and dust need to be removed by mechanical means such as a sanding machine. Possible surface irregularities need to be smoothened.

Repair of cracks

The careful sealing of existing cracks and joints before the application is extremely important for long lasting waterproofing results.

1. Clean cracks and hairline cracks, from dust, residues or other contamination.
2. Cracks and joints larger than 2 Äì 3mm must be primed locally with solvent based primer ISOCRYL PRIMER DUR, or waterbased primer ISOCRYL PRIMER DUR AQUA and allow drying. Fill all prepared cracks with elastomeric acrylic filler FLEX.
3. Bigger cracks and expansion joins must be primed locally with polyurethane primer PRIMER PU 900 and filled with polyurethane sealant BONDFLEX.
4. Small cracks up to 2 Äì 3mm must be primed locally with solvent based primer ISOCRYL PRIMER DUR, or waterbased primer ISOCRYL PRIMER DUR AQUA and allow drying. Apply locally one coat of ISOCRYL PREMIUM and on the wet coat dip a fibre net (30gr/m²) or fibre tape (60gr/m²) 4 – 10cm wide and recoat with ISOCRYL PU HYBRID PREMIUM.

Priming

1. Prime absorbent surfaces like concrete, cement screed, wood with solvent based primer ISOCRYL PRIMER DUR, or waterbased primer ISOCRYL PRIMER DUR AQUA. Allow drying for 2 Äì 4 hours.
2. Prime non-porous or difficult surfaces (metal, ceramic tiles, plastics) with ADHESIL PRIMER.

Application

1. Stir product well before use.
2. Poor the ISOCRYL PU HYBRID PREMIUM diluted 10 Äì 15% with clean water onto the primed surface and spread it using a roller or brush, until all surface is covered. You can use airless spray allowing a considerable saving on labour cost. Allow drying for 6 Äì 18 hours
3. Apply a second layer of ISOCRYL PU HYBRID PREMIUM crossways to the first layer, diluted up to max 5%.
4. For extra protection or were required a third layer may be applied.
5. Surfaces can be walked on at least after 48 hours. New treated surfaces exhibit a tackiness at the beginning, which disappears in due time.
6. Application of ISOCRYL PU HYBRID PREMIUM must be avoided at temperatures below 8^oC and above 35^oC and when frost or rain is expected.

RECOMMENDATION: We recommend reinforcement of the entire surface, with the fibre cloth. Use 5-10cm stripe overlapping. If ISOCRYL PU HYBRID PREMIUM is applied without the fibre cloth reinforcement we recommend a three-layer application.

ATTENTION: Do not apply ISOCRYL PU HYBRID PREMIUM over 0.5 mm thickness (dry film) per layer. For best results, the
temperature during application and curing should be between 5^oC and 35^oC.
Low temperatures delay curing while high temperatures speed up curing. High humidity may affect the final finish.