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Primer Fillers/Surfacers
This type of product has a higher solids content (usually talc or similar) which is used to provide filling properties. `Filling' and `Surfacing' in terms of primer and other sprayable products means the ability to fill small surface scratches and defects left by previous preparation, not dents, gouges and deep scratches. Once again, we have the choice between air-dry and 2-pack.
Air dry primer fillers are available from factors and in aerosol form, and are primarily cellulose or acrylic products. Their main advantages are fast initial drying times, the disadvantages being lower filling power, reactions with underlying paint products and sinkage if not dried properly. If bought from a trade factor, most of these products will need to be thinned, usually 50/50 with the appropriate thinners. Follow the particular products guidelines.
Synthetic resin based primer fillers are still available, but are not now in common use, even though they did have some good properties to outweigh their long drying times.
Application is normally two or three coats with adequate drying time between coats to allow solvent to evaporate. Particularly heavy coats will need additional time to dry out, otherwise solvent will remain trapped below the surface which dries rapidly. A greater number of thin coats - well dried between coats - is preferable to fewer thick, heavy coats.>>>Continued
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