PPG NovaGuard 4701 is a two-part glass flake vinylester primer for concrete and steel as a holding primer for Novaguard 4801. Suitable for >80°C (176°F) service temperature depending on the actual environment when suitably overcoated.

Top Features & Benefits

• Suitable for application to steel or concrete
• Holding primer for NOVAGUARD 4801
• Suitable for service temperature >80°C (176°F) when overcoated with NOVAGUARD 4801 dependent on the actual environment

Product Data

Basic data at 20°C (68°F)

Note - refer to tables below for information regarding spreading rate and film thickness, overcoating intervals and curing times.

Product contains volatile liquid convertible to solids. Volume solids obtained will vary dependent upon polymerization conditions

Preparation & Application

Recommended Substrate Conditions & Temperatures

Steel

• Steel; blast cleaned to ISO Sa2½, SSCP-SP10
• This primer should not be used where there is a risk of contaminant above pH 9

Concrete

• Dried for at least 28 days in good ventilation conditions
• Moisture content should not exceed 4.5%
• Concrete must be sound, dry, free from laitance and any contamination
• Rough surface; eventually abraded by power tool or diamond abrading tool

Substrate temperature and application conditions

• Substrate temperature during application and curing should be above 10°C (50°F)
• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point
• Relative humidity during application and curing should not exceed 85%

Instructions For Use

Mixing ratio by volume: base to catalyst 98:2

• The reaction between the base component and catalyst is highly exothermic, deviation from the recommended mixing ratio should not be undertaken.
• Pre-mix base component with a pneumatic air mixer at moderate speeds to homogenize the container
• Add the catalyst while stirring the base
• Mix thoroughly before application

Application

• Never add any solvent
• Never add the catalyst without continuous stirring

Airless spray

• Airless pump 30:1 or greater, fit leather or FPTE seals and remove fluid filters, 10 mm diameter (0.375 in) nylon-lined hoses
• Typical tip size is 0.46 – 0.74 mm (0.018 – 0.029 in) with reverse clean and 45° fan pattern
• The size of tip and fan pattern will vary with the nature of the work
• Use pressure to suit hose lengths and working conditions (circa 200 bar)

Brush/roller

• For small areas only (touch up and repair)

Note: Surface should be flash blasted to provide physical key

Cleaning solvent

• THINNER 50-02

Additional Data

Notes:

• The maximum recoating time will reduce significantly at high temperature or in strong sunlight
• Once the maximum recoating time has been reached, adhesion values attained by an subsequent coat will reduce dramatically
• When this occurs, overcoating should be treated as repair with the coating flash blasted to provide a physical key
• Styrene cannot be used to reactivate the surface of this product and may impair adhesion
• Take care to avoid contamination before application or subsequent coat

Notes:

• Full cure times are irrelevant for this product as it is purely a holding primer
• Adequate ventilation must be maintained during application and curing

Pot Life

• 1 hour at 20°C (68°F)

Note: The pot life will vary substantially with temperature

Safety Precautions

• Since improper use and handling can be hazardous to health and cause of fire or explosion, safety precautions included with Product Data/Application Instruction and Material Safety Data Sheet must be observed during all storage, handling, use and drying periods
• The catalyst of this product is supplied in small polythene bottles separately from the pigmented base component
• It is a highly reactive, combustible and thermally unstable substance that can undergo self-accelerating decomposition
• It is also a powerful oxidizing agent and will react violently with other organic chemicals
• It is thus recommended to keep in original containers, to hold within the predetermined temperature limits, to prevent contact/contamination with other materials, and to minimize the quantity at the workplace – only have enough present for the job in hand
• The waste of this product should be treated with special care; please contact the manufacturer (PPG) for more details