PPG SIGMACOVER 350 LT High-build Epoxy Primer/Topcoat

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Introduction

A two-component, polyamide-cured, high-build epoxy primer/topcoat based on pure epoxy technology.

Key properties

• A surface-tolerant epoxy primer/topcoat widely used in marine and industrial protection.
• For ship coating: suitable for topsides, decks, superstructures and dry cargo holds.
• Excellent anti-corrosion properties.
• Generally good overcoating compatibility on various old coating surfaces.
• At a temperature of 10 °C (50 °F), the hard dry time of the coating used on walkway undersides is 8 h.
• Good impact and abrasion resistance.
• Smooth film, easy-to-clean coating.
• Curing temperature may be as low as −5 °C (23 °F).

Colour and gloss

• Standard colours kept in stock, or colours may be customised to customer requirements, including silver (aluminium).
• Note: for dry cargo holds, only grey and red-brown.
• Semi-gloss

Notes

• Epoxy coatings exposed to sunlight, heat or chemical contamination generally chalk and fade to varying degrees. Normal chalking and colour variation do not materially affect coating performance. Light-coloured coatings tend to darken over time. Since the product is not precisely tinted at the factory, slight colour differences in the coating appearance between batches are normal.

Basic data, 10 °C (50 °F)

Parameters after mixing

Maximum 361.0 g/L (approx. 3.0 lb/gal) (theoretical calculated value).

4.8 m²/L at 150 µm (192 ft²/US gal at 6.0 mil).

Maximum time: 14 days.

Curing agent: at least 24 months; store in a dry and cool environment.

Notes

• See the supplementary data sheet — theoretical spreading rate versus dry film thickness table.
• See supplementary parameters — recoat interval table.
• See supplementary parameters table — curing time table.

Recommended substrate condition and temperature

Substrate condition

• Bare steel; to ensure excellent anticorrosive performance of the coating, abrasive blast cleaning to Sa 2½ of international standard ISO 8501-1 is required, with a surface roughness of 40-70 µm (1.6-2.8 mil).
• Bare steel: blast clean to Sa 2 of international standard I, with a roughness of 40-70 µm (1.6-2.8 mil), or prepare to St 2 of the international standard by power tool, which also provides good anticorrosive performance.
• The previous coat must be clean, dry and free of all contaminants.
• Previous coat: if necessary, abrade thoroughly before coating.
• When the substrate temperature falls to freezing point, check that the entire surface is free of ice.

Concrete surfaces may also be coated directly after thinning the paint

• Dried for at least 28 days in a well-ventilated environment.
• The internal moisture content must not exceed 4.5%.
• The concrete substrate must be sound, clean, dry and free of all laitance and contaminants.
• Uneven, rough surfaces: finally grind smooth with power tools or emery discs.

Concrete surfaces already protected by a coating

• Firm and well-adhered existing coatings: abrade thoroughly and ensure the surface is clean and dry.
• To ensure compatibility with the substrate, first wipe the old coating surface with a clean cloth moistened with xylene or MEK. If the solvent is found to dissolve the old film, it shall be wiped off.
• Uneven, rough surfaces: finally grind smooth with power tools or emery discs.

Substrate temperature and application conditions

• During application and curing, the substrate temperature should be kept between -5 °C (23 °F) and 15 °C (59 °F).
• During application and curing, the substrate temperature must be at least 3 °C (5 °F) above the dew point.

Coating system specification

• Epoxy 350 LT (Winter Grade) 2 x 125 µm

Instructions for use

Mixing ratio by volume: base : curing agent = 4:1

• As far as possible, ensure the mixed paint temperature of the base and curing agent is above 5 °C (41 °F); otherwise, additional thinner may be required to adjust the viscosity to a suitable application state.
• Excessive thinning may reduce the sag resistance of the wet film, slow hard drying and even reduce strength.
• The thinner should be added after the two components are mixed.

Notes

• See supplementary parameters — pot life after mixing.

Air spray

Airless spray (single-feed pump)

Brush/roller

Cleaning solvent

• THINNER 90-53

Supplementary parameters

Film thickness and theoretical spreading rate

Notes

• Maximum DFT (brush): 100 µm (4.0 mils)

Recoat time for a coating at 150 µm (6.0 mils) dry film thickness

Notes

• The practical maximum recoat interval is affected by local conditions
• To ensure optimum adhesion of the next coat, the surface shall be dry and free from any contamination (oil, grease, chalking and the like)

Curing time for a coating at 150 µm (6.0 mils) dry film thickness

Notes

• Adequate and continuous ventilation must be maintained during application and curing of the coating.
• If Epoxy 350 LT (Winter Grade) is applied excessively thick in a single coat, or if the total film thickness of the coating system (2 x 125 µm) is exceeded, the full curing time of the coating will necessarily be extended accordingly.
• Notes for use as a protective coating for dry cargo holds: for the required time for the coating system to reach full cure before loading angular hard cargoes, consult the PPG Protective & Marine Coatings Technical Support and Service.

Pot life (at normal application viscosity)

• Refer to the Material Safety Data Sheet and product package labelling for full details of the stated safety precautions and protective measures
• This is a solvent-borne coating. Avoid inhaling spray and solvent vapours, and avoid contact of uncured paint with skin and eyes

Worldwide applicability

Although PPG Protective & Marine Coatings is committed to providing completely consistent products to users worldwide, from time to time it may be necessary to make minor adjustments to specific products to comply with local/national regulations or environmental requirements. In the following cases, use the corresponding alternative version of the product data sheet instead.

Reference information

• Information sheet | Explanation of product data sheets

Quality guarantee

PPG warrants (1) that it has good title to the product, (2) that the product quality conforms to the relevant technical quality specifications in force at the date of manufacture of the product, and (3) that the supplied product is free of lawful claims by third parties for infringement of US patent rights. The above warranties are limited to those given by PPG and other express or implied warranties required by applicable laws and regulations for transactions and commercial practice; any abuse contrary to the stated conditions, and any other warranty for special purposes or uses, are excluded, and PPG shall be free from liability. To claim under this warranty, the buyer must notify PPG in writing within five (5) days of discovering the quality defect, and the date must be within the product's valid storage period or within one (1) year from delivery of the product to the buyer. If the buyer fails to notify PPG of the defect as required above, this will prejudice the buyer's right to obtain compensation under this warranty from PPG!

Limitation of liability

In all cases, PPG shall not be liable for any indirect, special, incidental or consequential loss of any kind arising from or in connection with the use of this product (whether based on negligence, strict liability or tort). The information in this product data sheet is based on laboratory tests we believe to be reliable, and is provided for guidance only. PPG may revise this information at any time as experience accumulates and product development progresses. All recommendations and advice concerning the use of this product, whether in technical documents, in response to an enquiry or otherwise, are given to the best of our knowledge and are believed to be reliable. Our products and related information are provided for industrial users possessing the necessary knowledge and practical skills, and it is the end user's responsibility to determine whether the product is suitable for the specific use. The buyer, having performed such evaluation, proceeds entirely at its own risk. The quality and condition of the substrate on site, and the many other factors affecting product use and application, are beyond PPG's control. Therefore, PPG accepts no liability for any loss, injury or damage arising from the use of the information in this product data sheet (unless otherwise provided in a written agreement). Different application environments, changes to the application process or extrapolation of the reference data may result in failure to achieve the expected coating quality. This product data sheet supersedes all previous versions. The buyer is responsible for confirming that the data sheet in hand is the latest version before using the product. The latest version is published on the official website of PPG Protective & Marine Coatings: www.ppgpmc.com. In case of discrepancy between the Chinese version and the original English version of the product data sheet, the English original shall prevail.

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