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Activator
Also commonly known as hardeners or catalysts, are the chemical agents which starts the hardening or drying process in bodyfillers, primers and paints where their use is indicated by the manufacturers. The correct type of activator for the product being used is essential, as the wrong type may delay or accelerate drying detrimentally, or may just be totally incompatible leading to a wasted mix.
Sealers/Isolators
Not to be confused with underseal or body sealing, alcohol based sealers can sometimes be used to isolate an old paint surface from attack by solvents in new refinish materials. Normally one or two coats of sealer are sprayed on the prepared surface before continuing with traditional primers etc. The sealing coat must not be flatted but primed once dry. Most isolators are sensitive to moisture and should be primed as soon as dry.
1K
Meaning 1 component. Also known as single-pack. Paints and lacquers, etc., which do not need a hardener or activator to make them dry or harden, although misleadingly some need to be thinned with a appropriate solvent before use. Some clear lacquers for example are sold ready for use, already thinned, straight from the tin, while others may need the addition of thinners.
2K
Meaning 2-Component. Also known as 2-packs, used to describe paints, primers and similar materials which require the addition of a catalyst (i.e. hardener, activator) before they will dry. (cure)
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