Guangzhou Jinwei Chemical Co., Ltd

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Primer Surfacer Application of Car Refinish
- Mar 08, 2018 -

Primer Surfacer Application of Car Refinish



(1)Apply P320 sandpaper to sand existing finishes. The adhesive power will be improved.

(2)Sand the area outside of putty around 100mm.


2.Cleaning and degreasing

Pay attention to clean particles in the pinhole and other cracks. Blow the surface with compressed air and remove grease with degreasing agent.



Cover other area to prevent the overspray of paint.



Shelter should be placed to make enough primer surfacer be exposed, and beyond the sanding area.

To avoid the primer surfacer to generate step, place shelter reversely.


4.Mixing primer surfacer

According to the instruction of producer, add hardener into primer surfacer by using appropriate measuring instruments, and dilute the mixture with thinner.



Primer surfacer must be fully mixed before applying on account of sinking of the pigment.

2k primer surfacer is recommended. 1k primer surfacer is easy to use but difficult to apply.

There are several thinner to choose in terms of ambient temperature.

Usually, the addition of thinner is allowed within certain limits by manufacturer. The excess addition is easy to apply but easy to generate runs. However, the coating is too thick and have a rough surface as a result of too little addition.

5.Applying primer surfacer

(1)Stir the mixture of primer surfacer, hardener and thinner with rabbler, then filter them to load the spray gun.

(2)Apply primer surfacer on the surface of putty.

(3)Flash-off time should be enough(some gloss is lost).

(4)Apply second and third coating.

(5)Apply sanding coating.



Expand slightly the applied area every time.

"Step" will emerge if primer surfacer is applied on the shelter.

More primer surfacer should be applied if there are sagging area on the putty.


6.Drying primer surfacer

(1)To ensure complete evaporation of solvent, but force drying method applied, the instruction of manufacturer must be followed and must choose adequate dry time. Need 5 -15 minutes for air dry before force drying.

(2)Dry the surface in accordance with the instruction.

Drying time: 15 to 20

minutes at 60, 90 to 120 minutes at 20.


7.Applying filler

(1)Check pinhole and sanding scratches.

(2)Apply filler.

Fillers: one-component and two-pack.

One-component: easy to use for repairing.


8.Sanding primer surfacer

Dry sanding or wet sanding(Sand the dried primer surfacer with P400-500. If it is necessary, wet sand partly with P600-800)

(1)Dry sanding by hand

Load P600 into handworked sander. The sandpaper is covered by particles easily. Keep to use the clean area of sandpaper or eliminate particles with brush.


(2)Dry sanding by sander

Load P400 sandpaper into difunctional polisher. Only use of polisher is not enough, then finish work by hand.


(3)Wet sanding by hand

Wet relevant surface. Load P600-800 sandpaper into handworked sander and sand. After sanding, drying must be done.


(4)Check the surface

If the surface is even, no putty bulge and metal substrate is not visible, then the sanding is over.