Car Paint Preparation



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Car Paint: Preparation

With the primer all cured and ready to rub down, the next step is to prep the car paint and body panel for paint application.

You will need to spray a guide coat over the primed area of the car paint and body with black aerosol paint, as you rub down the primer it will rub of the black paint and show were the primer has been taken off.


car paint



As it is taken off there should be a flat, smooth surface over the car paint and body area. If there are low spot in the primer, take the blocking down a bit further using it flat to the panel, trying not to use the edge of the block. The whole process should be rubbed as much as possible using the center of the block to keep the guide coat shown the reality of what is lower than the rest

It is tempting for some people to use there hands, but i would not agree as this leads to what is known as tram lines. Tram lines are were the fingers push on the primer and cause lines to appear when the final finish gloss paint is applied.

The primer should be first rubbed down with a 320 grade paper on a block until the guide coat is gone, and  the edge of the primer should totally be smoothed to the car paint on the body panel.

Next more guide coat should be applied to the primer area again, this time you should be using 500 disc on a sander. This is to sand the 320 grit paper scratches away as these will be seen if painted over.


Once you are happy that the scratches are all gone,  It is time to make the car paint and body panel as clean as possible. The cleaner that you are through the process, the cleaner the end result will be.

The degrease is needed to keep the body panels grease free, and to stop any contamination in the paint once applied. Make sure to clean behind the panels, if for example you are painting a door, you will need to clean all the inside of grease and dirt in order not to accidentally smear it around, this will also make it easier to mask out the doors, being that the masking tape will stick better without any grease and dirt in the way.

car paint


Now for the masking, it is going to be different for what ever body panel you are going to paint, and so i will stay with the doors for the example. Lets say that you have two doors to paint, the best door to mask first is the back door. You need to put masking tape on the back edge of the door so that half the masking tape is on the door and half is off the door hanging in the air, so that when the door is shut, the half in the air is now a flap that is sat to the adjacent body panel, in this example the rear quarter body panel.

Now with the flap sat on the rear quarter another piece of masking tape is used to tape down the flap to the body panel, this masking tape has now been securely masked down to stop it blowing off from the the air pressure, and the door shut has now been protected from paint being sprayed in to it.

Ultimately the end result for masking tape is to stop the paint going were you don’t want it to.

With the doors masked up, all that is needed now is the plastic sheet to cover the car, the same as the you did during the primer process and cut out the area you are painting.

Any questions about car paint and body repairs, please ask below.


2 Responses to Car Paint Preparation

  1. evan says:

    i was wondering what should you put in the paint. and how thick the paint should be

    • BOB says:

      I need more information, like what type of paint it is, and the ratio of it should be easier for me to tell you.

      Try and get the make of the paint,and the type it is.

      Sorry, can’t help more till I have that.

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