What is a guide coat? He said it comes primed white??
the process below:
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High build primer
A high build primer is the next step after self etch priming. The high build primer adds a relatively thick coating of paint which is sandable and is used to remove the imperfections in the panel. Normally two coats of high build primer will be sufficient.
High build primer is available in cellulose and 2-pack. 2-pack requires a greater level of safety equipment than cellulose, but will tend to go on thicker and smoother than cellulose, and does not suffer from sinkage to the same degree. I've applied two coats on the outside of the car and a single coat on the inside.
Care should be taken not to build up excessive paint thickness at door edges or they will be prone to chips.
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Flatting with a guide coat
A guide coat is a thin mist of colour applied over high build primer and then wet flatted off. Initial sanding will remove the high points, and it is only when the whole of the guide coat has been removed that the high points of the panel will be level with the low points - then the surface will be completely smooth and ready for top coating.
Guide coat sanding is done immediately before the colour coat. My approach for a guide coat is to mix evenly colour with primer then add at least 75% thinners. The primer content aids sanding and thickens the guide coat so it doesn't disappear before the panel is flat. Using the top coat colour prevents problems with painting over any guide coat that isn't completely sanded off.
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