International Interplus 356

Part A and B: UN1263 (Class: 3, Pk Grp: III)
A low VOC, two component, internally flexibilised, high build, low temperature curing (down to -5°C), surface tolerant epoxy primer.
Available in 5 Litres in Aluminium
£137.48 £114.57
In stock
Product Description

International Interplus 356 is a low VOC, two component, internally flexibilised, high build, low temperature curing (down to -5°C), surface tolerant epoxy primer. Metallic pigmented with aluminium and lamellar micaceous iron oxide for increased corrosion resistance.

Best Uses

International Interplus 356 is formulated as a high performance maintenance coating for use on a wide variety of surfaces including hand or power tool cleaned rusty steel. Specifically designed for use at low temperatures or where rapid overcoating is essential. Ideal for use in conjunction with wet abrasive blasting and ultra high pressure water blasting.

Interplus 356 is particularly useful in the maintenance of offshore structures and other aggressive environments such as refineries, chemical plants, coastal structures, pulp and paper mills and bridges when dry abrasive blasting is not possible.

Available in Aluminium Grey in a matt finish.


The performance of this product will depend upon the degree of surface preparation. The surface to be coated should be clean, dry and free from contamination. Prior to paint application, all surfaces should be assessed and treated in accordance with ISO 8504:2000. Accumulated dirt and soluble salts must be removed. Dry bristle brushing will normally be adequate for accumulated dirt. Soluble salts should be removed by fresh water washing.

Abrasive Blast Cleaning
Interplus 356 may be applied to a surface abrasive blast cleaned to a minimum Sa1 (ISO 8501-1:2007) C or D grade rusting, or SSPC SP7.

Hand or Power Tool Preparation
Hand or power tool clean to a minimum of St2 (ISO 8501-1:2007) or SSPC-SP2. Note, all scale must be removed and areas which cannot be prepared adequately by chipping or needle gun should be spot blasted to a minimum standard of Sa2 (ISO 8501-1:2007) or SSPC-SP6. Typically this would apply to C or D grade rusting in this standard. On steel surfaces operating at in-service temperatures up to 100°C (212°F) cleaning to a minimum St3 (ISO 8501-1:2007) or SSPC-SP3 is required for optimum performance.

Ultra High Pressure Hydroblasting / Abrasive Wet Blasting
May be applied to surfaces prepared to Sa2½ (ISO 8501-1:2007) or SSPC-SP6 which have flash rusted to no worse than Grade HB2½M (refer to International Hydroblasting Standards) or Grade SB2½M (refer to International Slurry Blasting Standards). It is also possible to apply to damp surfaces in some circumstances. Further information is available from Promain's techncial team.

Aged Coatings
Interplus 356 is suitable for overlap onto most aged coating systems. Loose or flaking coatings should be removed back to a firm edge. Glossy epoxies and polyurethanes may require abrasion.

Technical Details


Interplus 356 will generally be applied to bare steel but is fully compatible for overlap onto most aged coatings, in addition to touch up repair of the following primers:

Recommended topcoats/intermediates are:

It should be noted that Interplus 356 is not suitable for overcoating with thin films of alkyd, chlorinated rubber, vinyl or acrylic finishes.

Technical Info

Components: Two Components
Type: Epoxy Primer
Finish: Matt
Stock Colours: Aluminium Grey
Tintable: Please note, bespoke tints are non refundable / exchangeable
VOC Content: 305 g/lt
Volume Solids: 70%
Suitable Substrates: A wide variety of surfaces including hand or power tool cleaned rusty steel
Application Method: Airless Spray, Air Spray - Blasted Sttel, Brush, Roller - hand or power tool prepared steel
Theoretical Coverage: 5.60 m²/litre at 125 microns d.f.t and stated volume solids
Wet Film Thickness (WFT): 107-179 microns
Dry Film Thickness (DFT): 75-125 microns
Induction Time: -
Pot Life: 4 hours at 15°C
Touch Dry: 2 hours at 15°C
Overcoatable: After minimum of 6 hours at 15°C
Hard Dry:  10 hours at 15°C
Cleaner / Thinner: International GTA220, clean tools with International GTA822
Shelf Life: 12 months minimum at 25°C subject to inspection thereafter
Packaging: Available in 20 Litres

The manufacturers data sheets are available for download from this website. It is your responsibility to read and understand all aspects of the data sheets before you place an order and prior to application. Please pay special attention to the preparation, mixing and application temperatures of the product, cleaning of substrate and environmental factors such as temperature, rain etc. Quoted coverage rates are based on the manufacturers theoretical rates and may vary depending upon substrates absorption, texture and application. We always recommend a test is carried out to ensure suitability.

Customer further agrees that Promain have no liability for any errors or omissions contained within the Product Data Sheets and are not liable for failure due to misapplication or inadequate substrate cleaning and preparation. For more information please refer to our Terms & Conditions.

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