Re: Combinations of paint and decals, stimulated by baking models, plastic or ot

Dennis Storzek <destorzek@...>

--- In STMFC@..., "Schuyler Larrabee"
<schuyler.larrabee@...> wrote:

Denny's question certainly stimulated a good deal of discussion.

Dennis, asserted that Scalecoat I is an enamel. Really? It's
thinner is lacquer thinner, doesn't
that suggest it really is a lacquer? That's always been my
impression, but willing to learn.

But "lacquer thinner" is just a generic name for a blend of toluene,
xylene, and other rather fast evaporating solvents that can be used to
thin a lot of coatings.

My working definitions, which I believe follow paint and coatings
industry conventions, are:

LACQUER A coating comprised of a resin dissolved in a solvent that
forms a solid film as the solvent evaporates. There is no
polymerization involved, so the dried coating can be re-dissolved by
an application of the solvent. Examples are shellac, a natural resin
dissolved in alcohol, and nitrocellulose lacquer, a plastic resin
dissolved in toluene.

ENAMEL A coating comprised of a resin dissolved in a solvent that
hardens through polymerization after the solvent evaporates. Once
cured, the resin film is chemically changed, and will not re-dissolve.
An example of a naturally occurring polymerizing resin is linseed oil,
which has been replaced by many synthetic resin systems.

Heating a lacquer to speed its drying just forces the solvents to
flash off faster, although a side benefit may be lowering the
viscosity of the liquid coating so it flows out better. Heating an
enamel first speeds the evaporation of the solvents, then speeds the


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