HS Master 4:1

Acrylic primer

1 8

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art. nr.


quantity per carton



0,8 l + 0,2 l




0,8 l + 0,2 l




0,8 l + 0,2 l


Gloss grade


1 8

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2K high build acrylic primer for car body repairs. Basic primer with good coverage and strong filling. Features very good adhesion to aluminum and steel surfaces as well as great vertical stability.


  • Easy to mix and apply.
  • Short curing time.
  • Good filling properties.


Acrylic Filler HS MASTER 5:1 can be applied over:

  • Steel and aluminum after flatting and degreasing.
  • Polyester glass laminates (GFK/GRP).
  • 2K polyester body fillers and putties.
  • Wash primers.
  • 2K epoxy primers.
  • Old finishes in good condition after matting and degreasing.

Good preparation is necessary for achieving best results.

Following sandpaper gradations are recommended:

  • by hand (dry or wet): P280÷P320 (GRP P400),
  • by machine (dry): P180÷P220.

Important informations


mixing ratio
4 : 1 + 15÷20%

spraying viscosity
30÷50 seconds at 20°C

pot life for the mixture
about 60 minutes at 20°C

2÷3 layers
about 80 µm for each layer

between layers
5 minutes

before baking
10 minutes

drying time
for total thickness of 200 µm
about 3÷4 hours at 20°C.
about 30 minutes at 60°C.

P360 ÷ P500

P600 ÷ P1000

Application process


For car repairs as a filling primer.

Mixing proportion per volume

Primer: 4 parts
Hardener: 1 part
Thinner: 15÷20%

Stir thoroughly until achieving homogenous mixture.

Spraying viscosity

30÷50 seconds at 20°C

Pot life

Approx. 60 minutes at 20°C.

Number of layers

2÷3 layers; 80µm for a single layer.

Parameters for RP spray gun
Nozzle: 1,6÷2,0 mm; Pressure : 2,0-2,2 bar.

Parameters for HVLP spray gun
Nozzle: 1,5÷1,9 mm; Inlet pressure: 2,0 bar.

Flash off time

Between layers: approx. 5 minutes
Before baking: approx. 10 minutes

Flash off time depends on temperature and film thickness.

Drying time

For thickness 200 µm
Approx. 3÷4 hours at 20°C.
Approx. 30min at 60°C.

Temperatures below 20°C significantly increases the drying time.

IR drying

150÷200µm: 10÷15 minutes under short wave.

Do not exceed 60oC.
Use as recommended by the equipment manufacturer.
Wait about 10 minutes before starting the heater drying.

Dry sanding

Machine sanding: P360÷P500.
Manual sanding: P280÷P320.

Wet sanding

Machine sanding: P600÷P1000.
Manual Sanding: P800÷P1000.

Further work

2K acrylic primers can be directly over coated with:
- 2K acrylic top coats.
- 1K base coats.

General notes

- Do not exceed recommended doses of hardener!
- The best repair results you can achieve at room temperature. Temperature in body shop and temperature of a product should be the same.
- When working with 2K products, it is recommended to use personal protection equipment. Protect the eyes and air ways.
- The rooms should be well ventilated.
- Clean the guns and equipment immediately after use.

Caution: To maintain safety, always follow the instructions given in the MSDS for the products.

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