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SafetyCrete Dairy Shed Repair Mortar

Epoxy resin with chemical resistance
2 Litres

4.155 GEMREZ CR 1:1
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Epoxy resin with chemical resistance, 2 Litres

Composition and Properties

  • 4.155 GEMREZ CR 1:1 is a two-part, solvent free, chemical resistant epoxy resin.
  • Can be applied over damp surfaces, and can cure below 0 ° C.
  • Formulated for use as a chemical resistant primer under 4.167 GEMCOAT CR 1:1 chemical & abrasion resistant coating, and 4.169 GEMCOAT CRT & CRT-SL chemical & abrasion resistant toppings.
  • Can be reinforced with binder free fibreglass, and other fibres – consult GemCo.
  • Used for coating concrete, steel, and fibreglass, and bunds exposed to chemical splash & spillage.
  • Resistant to most concentrated acids & alkalis, and many common chemicals – consult with GemCo.
  • Two coats of 4.167 GEMCOAT CR 1:1 recommended over 4.155 GEMREZ CR 1:1 chemical resistant epoxy resin

Physical properties

  • Appearance:                       Base – clear resin; Hardener – clear amber liquid
  • Odour:                                Low odour
  • Solids:                                100 %
  • Coating Type:                     Epoxy
  • Packaging:                         2 & 8 litre , two part packs
  • Mix ratio:                             1 part base :1 part hardener by volume
  • Pot Life:                              30 min @ 20 ° C (200ml mix) – will vary with temperature and amount mixed
  • Coverage:                          5 sq m/litre @ 200 microns – will vary with substrate
  • Cure Hard:                          24 hours @ 20 ° C; 7 days recommended before putting in service

Surface Preparation

  • All oil, grease, and other contaminants must be removed.
  • Concrete: Must be minimum of 4 weeks old. Grind to remove laitance and leave clean, sound substrate. On previously painted concrete physically remove coating by suitable means e.g. grinding, sweep blasting etc.
  • Steel: Blast with a suitable abrasive to near white metal (SSPC 10/SA 2.5 standard). If this is not possible remove loose material by mechanical cleaning or high-pressure water blast until only tight rust is left.
  • Fibreglass: Abrade surface to give a good key.
  • All surfaces must be free of dust or other contaminants before applying 4.155 GEMREZ CR 1:1

Method of Application

  • Add 1 part hardener to 1 part base by volume and thoroughly mix for at least 1 minute.
  • A drill with a mixing blade is required.
  • Mixing 1 litre of part A & 1 litre of part B is a good mix size.
  • In cold weather warming base & hardener to 25 ° C will make mixing easier.
  • Apply by good quality brush, and short nap roller.
  • Do not overbuild on vertical surfaces or product may run.
  • It is better to apply in thin coats and apply extra coats to achieve correct film thickness and coverage.
  • For example, apply 4 thin coats on a vertical surface instead of 2 full coats.
  • Recoat within 24 hours.
  • System typically cures hard within 24 hours - if possible, cure for a further 16 hours @ 50° C.
  • Allow 2 days minimum before putting into service – 7 days is preferred.

Handling Precautions

  • Avoid contact with eyes and skin. Do not ingest. Use with adequate ventilation.
  • Use a respirator in confined spaces.
  • Wear protective clothing, safety glasses, and gloves. Keep away from children.


The information provided is accurate to the best of our knowledge. We can not however anticipate all conditions under which this information and our products may be used. We therefore accept no responsibility for results obtained by the application of our products, or  for their safe use  and suitability. GemCo Limited sells these products without warranty and buyers  and users assume  all  responsibility and liability for loss or damage arising from the handling  and use of our products.