► Tips to optimise the bodywork putty (body filler) application.
Let us now look at the steps that will allow optimising the putty application process, while increasing the profitability of the repair.

1. Correct choice of putty according to the type of repair
It is essential that the bodywork putty used adheres well to the type of material to be applied, whether plastic or metal, and that it is compatible with the primer.

It should be noted that putties should never be applied over wash primers, or acid primers or phosphate primers, as they are incompatible with this type of product. As usual, the different compatibilities between the putty and the type of material to be treated will be stated in the data sheet.

2. Correct pre-surface preparation
Before starting with the filling, the painted damaged edges to be repaired should be levelled, sanding the surface with a grit sandpaper between P80 – P120 and 5mm orbit, depending on the repair.

3. Correct preparation of the mix
First of all, check that the working tools have no traces of putty or hardener used in previous repairs, in order to make a smooth and regular application on the surface.

4. How to apply the polyester putty
In this step the concept “pot life” of the mixture, that is, the time you have between the moment you mix the putty with the hardener until the mixture hardens, becomes especially relevant. This time may also be influenced by both ambient and substrate temperature.
When applying the putty, it must be spread evenly, making even coats from one end to the other and exerting appropriate pressure on the spatula. This will enable removing air occluded during application, in order to obtain a smooth and regular surface.

5. Always comply with the putty’s drying times
The putty’s drying time is stated in the technical data sheet and will start right at the moment the mixing takes place, leading to the chemical reaction and subsequent hardening.

Depending on ambient temperature, this drying process will be faster at high temperatures, and slower at low temperatures. In addition, the support’s (metal or plastic) temperature can also influence the drying time.

Generally, the drying time of the putty is between 20 and 30 minutes (5 minutes with short wave infrared) at a temperature close to 20ºC (it can vary depending on the type of putty).

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