Patching compound is a Php20-Php25 per kg white powder purchased at paint stores and hardware. Old school painters mix this powder with flat latex paint to produce a thick mix which they use as primer for plywood to hide the grains and make a smooth surface before applying the final paint coat. The mix can also be used to repair cracks and small holes on walls. Painters prefer this mix because they dry rapidly. However, it cracks over time. A better solution would be to use acrylic-based wall putty.
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Generally a base that has more pigment dries longer. Latex is fastest regardless of colour.
it dries out
Only if it dries out.
What dries fast is not so much the paint, but the fresh plaster on which the fresco paint is applied. And as the plaster dries the paint unites with it.
"Fastest" is the superlative of "fast."