English (United Kingdom) - Paul Wurth

HEMPEL'S VINYL ESTER GF 35910
Issued: March 2010 Page 3 of 4
HEMPEL’S VINYL ESTER GF 35910 MUST NOT be exposed to condensation or Relative
Humidity higher than 85% before recoating.
*Intervals at and above 25°C/77°F is based on an addition of Retarder 99190.
Strong ultraviolet/sunlight will reduce maximum recoating interval significantly.
Cleaning of tools: The equipment should be flushed out and cleaned using styrene followed by methyl
ethyl ketone (MEK).
Curing table: The following curing times apply:
Steel temperature 10°C/50°F 15°C/59°F 20°C/68°F 25°C/77°F 30°C/86°F (35°C/95°F)
Fully cured 8 days 6 days 4 days 3 days 2 days (2 days)
Time before taking When the painted surface will be exposed to heavy duty service (e.g. exposure to
into service: chemicals, heavy wear and tear), the recommended minimum curing time is:
Steel temperature 10°C/50°F 15°C/59°F 20°C/68°F 25°C/77°F 30°C/86°F (35°C/95°F)
Minimum 8 days 6 days 4 days 3 days 2 days (2 days)
HEMPEL’S VINYL ESTER GF 35910 is resistant to immersion in calm seawater and
other less aggressive water immersion service after an initial curing time as listed
hereunder:
Steel temperature 10°C/50°F 15°C/59°F 20°C/68°F 25°C/77°F 30°C/86°F (35°C/95°F)
Minimum 60 hours 40 hours 24 hours 24 hours 18 hours (12 hours)
Notes: 1. The temperatures in the tables above are mean values.
2. Curing will proceed under water.
3. Less curing than stated above before exposure to seawater may result in significant
discoloration of the surface.
Post curing: Post-cure of HEMPEL’S VINYL ESTER GF 35910 is possible and may be mandatory in
case of special service conditions. The following procedure must be followed:-
- Allow the lining to cure for a minimum of 12 hours after application of last coat.
- Raise the temperature within the vessel to between 60ºC and 80ºC using dry heat (The
temperature must not exceed 100ºC).
- Maintain this temperature for between 6 and 8 hours.
Remarks: In case of deep pittings higher film thickness is recommended on areas with pittings.
To secure sufficient curing at low surface temperatures as well as to secure a pinholefree
paint film at any temperature, the product should always be applied in a wet film
thickness above 600 micron.
Quality Control: As HEMPEL’S VINYL ESTER GF 35910 is often used in highly corrosive service proper
quality control is of particular importance. Such controls should include following:
1. Control that the proper dry film thickness has been achieved
2. Holiday/pinhole detection at high voltage (Voltage according to specified thickness)
3. Test of full cure (Acetone test)
a. A small area should be washed with clean Acetone to dissolve the surface
inhibited film and remove stickiness; the area should then be allowed to
dry.
b. Gently rub the washed surface with a piece of cloth soaked with Acetone.
Should the surface become tacky or if it was impossible to obtain a tack
free surface under a), then the coating is not fully cured.
Repairs: It is of great importance that all damage to the coating is repaired.
Repair must be started up as soon as possible. Repair of mountings for staging,
pinholes etc. must take place in connection with the dismantling of the staging, the
tempo of which shall be adjusted to the touch-up procedure.
It is important that the repaired areas, as well as the rest of the coated areas, are fully
cured before the tank is taken into use.
Application Instructions