Post by Stephen HullPost by paulfoelDoes this mean White Spirit or Turps (substitute) or something
different???
Cellulose thinner is/was derived from the cotton plant, described as a
very volatile aggressive solvent and when used as a medium for paint
(cellulose paint) it is resoluble, meaning is can be dissolved or
redissolved in its own solvent, this is how the cellulose paint
finishing system works by softening the underneath layers of (cellulose)
paint which forms a unique solid bonded mass paint thickness and not as
individual layers.
Turpentine is a mild resinous extract taken from pine trees described as
an oil or spirit, it it not resoluble it its own solvent which is why
you don't get solvent reactions with turpentine based paints etc, this
paint medium lays on top of each layer separately each as an individual
layer and does not form a solid bonded mass paint thickness.
You can wipe turpentine solvents over cellulose paint without affecting
the finish at all but you cannot wipe cellulose thinner over turps based
finishes or indeed cellulose because it will react, soften or lift the
paint finish like paint remover.
Turpentine, turpentine substitute, and white spirit are all compatible
with each other as they are not aggressive solvents unlike cellulose.
Stephen.
cellulose is not a solvent.
Nor IIRC is it derived from cotton any more. IIRC its pretty much
cellulose acetate that is what is referred to as 'cellulose' or 'celluloid'
Cellulose SOLVENTS (things that dissolve cellulose, not are made from
it) are aggressive organic solvents mostly derived from the
petrochemical indsustry, unlike alcohols (mainly derived from starches
by fermentation) or turpentine,. which is an oily complex substance
derived from wood, or white spirit, which is either is syntehtic, or
refined version of turpentine. Wiki says its a paraffin derived
synthetic..well from oil rather than wood anyway.
What is in a typical 'cellulose' solvent is pretty variable. Has to be
since the cellulose itself may be acetate, nitrate or butyrate, and
there are various properties of the solvent like speed of evaporation
and water absorption etc. etc. that affect how its used.
A bit of idle googling reveals that ethyl acetate (pear drops) is one as
is methyl acetate, certainly acetone ethylene glycol diacetate is used..