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Jota EP Mastic 66

Jota EP Mastic 66

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Product description

Jota EP Mastic 66 is a two component polyamine cured epoxy mastic coating. It is a surface product. Specially designed for areas where optimum surface preparation is not possible or desired. Can be used as primer or mid coat in atmospheric and immersed environments. Suitable for properly prepared carbon steel and aged coating surfaces.

Typical use of Jota EP Mastic 66 Remembered for general structural steel.

Colours: Black, grey, red

Product data

Property                                               Test/Standard                                                  Description

Solids by volume                                 ISO 3233                                                              52 ± 2 %

Gloss level (60o)                                   ISO 2813                                                            matt (0-35)

Flash point                                            ISO 3679 Method 1                                                25oC

VOC-Solvent Emission Directive    SED (1999/13/EC)                                          324 g/kg

The provided data is typical for factory produced products, subject to slight varitation depending on colour.

All data is valid for mixed paint

Gloss level : According to Jotun Performance Coatings’ definition.

Recommended film thickness per coat

Film thickness and spreading rate      Minimum                   Maximum               Typical     

Dry film thickness                                       100µm                        150µm                   100µm

Wet film thickness                                       195µm                         290µm                  195µm

Theoretical spreading rate                        5,2m2/l                        3,4m2/l                   5,2m2/l

Surface preparation

To secure lasting adhesion to the subsequent product all surfaces shall be clean, dry and free from any contamination.

Surface preparation summary 

Substrate                        Minimum                                               Recommended                

Carbon steel              St 2 (ISO 8501 – 1)                                 Sa 21/2 (ISO 8501-1)

Shop primed steel    Clean, dry and undamaged shop           Sa 2 (ISO 8501-1)

Primer (ISO 12944-4  6.1)

Coated surfaces       Clean, dry and undamaged                    Clean, dry and undamaged

Compatible coating                                compatible coating

(ISO 12944-4  6.1)                                  (ISO 12944-4  6.1)


Application methods

The product can be applied by

Spray : Use airless spray.

Brush : May be used. Care must be taken to achieved the specified dry film thickness

Roller : May be used. However when using roller application care must be taken to apply                                                sufficient material in order to achieve the specified dry film thickness.

Product mixing ratio (by volume)

Jota EP Mastic 66 Comp A         6 part(s)

Jota EP Mastic 66 Comp B         1 part(s)

Dry and curing time                  

Substrate temperature               10 oC      23 oC      40 oC  

Surface (touch) dry                       5h         2.5h        1h

Walk-on-dry                                   16h       8h          3.5h

Dried to over coat, minimum       16h        8h          4.5h

Dried/cured for service                14d         7d           3d

Drying and curing times are determined under controlled temperatures and relative humidity below 85%, and within the DFT range of the product.

Surface (touch) dry : The state of drying when slight pressure with a finger does not leave an imprint or reveal tackiness. Dry sand sprinkled on the surface can be brushed off without sticking to or causing damage to the surface.

Walk-on-dry : Minimum time before the coating can tolerate normal foot traffic without permanent marks, imprints or other physical damage.

Dry to over coat, minimum : The shortest time allowed before the next coat can be applied.

Dried/cured for service : Minimum time before the coating can be permanently exposed to the intended environment/medium.

Induction time and Pot life

Paint temperature    23oC

Pot life                        6h

Heat resistance

Temperature                     Continuous              Peak

Dry, atmospheric                    90oC                    90oC

Immersed, sea water              50OC                   60OC

Peak temperature duration max.1 hour.

The themperatures listed relate to retention of protective properties may suffer at these temperatures.

Note that the coating will be resistant to various immersion temperatures depending on the specific chemical and whether immersion is constant or intermitent. Heat resistance is influenced by the total coating system. If used as part of a system, ensure all coatings in the system have similar heat resistance.

Product compatibility

Depending on the actual exposure of the coating system, various primers and topcoats can be used in combination with this product. Some examples are shown below. Contact Jotun for specific system recommendation.

Previous coat : epoxy shop primer, inorganic zinc silicate shop primer, epoxy, epoxy mastic, inorganic zinc silicate

Subsequent coat : polyurethane, epoxy.

Packaging (typical)               

                                                       Volume (litres)    Size of containers (litres)

Jota EP Mastic 66 Comp A           17.1/4.3                           20/5

Jota EP Mastic 66 Comp B            2.9/0.7                             3/1

The volume stated is for factory made colours. Note that local variants in pack size and filled volumes can vary due to local regulations.


The product must be stored in accordance with national regulations. Keep the container in a dry, cool, well ventilated space and away from sources of heat ignition. Containers must be kept tightly closed. Handle with care.

Shelf life at 23oC

Jota EP Mastic 66 Comp A     48 month(s)          

Jota EP Mastic 66 Comp A      48 month(s)               

In some markets commercial shelf life can be dictated shorter by local legislation. The above is minimum shelf life, thereafter the paint quality is subject to re-inspection.


This product is for professional use only. The applicators and operators shall be trained, experienced and have the capability and equipment to mix/stir and apply the coatings correctly and according to Jotun’s techical documentation. Applicators and operators shall use appropriate persional protection equipment when using this product. This guideline is given based on the current knowledge of the product. Any suggested deviation to suit the site conditions shall be forwarded to the responsible Jotun representative for approval before commencing the work.

Health and safety

Please observe the precautionary notices displayed on the container. Use under well ventilated conditions. Do not inhale spray mist.Avoid skin contact.Spillage on the skin should immediately be removed with suitable cleaser, soap and water. Eyes should be well flushed with water and medical attention sought immediately.

Colour variation

When applicable, products primarily meant for use as primers or antifoulings may have slight colour variations from batch to batch. Such products may fade and chalk when exposed to sunlight and weathering.


The information in this document is given to the best of Jotun’s knowlege, based on laboratory testing and pracial experience. Jotun’s products are considered as semi-finished goods and as such, products are often used under conditions beyond Jotun’s control.Jotun cannot guarantee anything but the quality of the product itself. Minor productt variations may be implemented in order to comply with local requirements.Jotun reserves the right to change the given data without further notice.

Users should always consult Jotun for specific guidance on the general suitability of this product for their needs and specific applicaton practices

If there is any inconsistency between different language issues of thi document, the English (United Kingdom) version will prevail.


We specialize in manufacturing, distributing and applying epoxy paints

Address: No.147, Road 28, Ward 6, Go Vap District, Ho Chi Minh City

Email :

Hotline : 028.22007114 – 028.22009114

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