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Paint Primers
From Transwiki
[edit] Types of primers
- Oil based - the best takes 24 hours to dry, smells, cleans up with paint thinner, penetrates wood and paper, and will last a life time.
- Shellac - alcohol solvent primmer - drys fast, seals well - cheaper than the best oil based.
- latex and other compromise primers - "If it doesn't stink, it won't sink!" If you think cleaning up with water saves you time - you are correct - each and every time you will paint - and you will scrape and paint often. It sits on top of the wood or paper and comes off. Don't use latex primers - especially for out side work.
[edit] Varnish vs Lacquer vs Shellac
In the USA, varnish refers to an oil-based solvent finish with a variety of dissolved resins.
The term lacquer comes from the lac insect (Laccifer lacca) whose secretion, called lac, are a polymer that is soluble in alcohol. Shellac is a brittle or flaky secretion of the lac insect. (In the UK however, the term lacquer has a different meaning; if you spray it, it's lacquer - if you brush it, it's varnish!) In America today the word lacquer refers to nitrocellulose dissolved in alcohol or a different solvent.
Shelac is a different 'lac'; a brittle or flaky secretion of a different lac insect, Coccus lacca.
