Misconceptions about Paints...

I was posting very frequently in several forums a while back and the most common question I get when it comes to painting is "What paint do you use?"  My usual response was "I use Bosny and/or RJ London paints, and they are basically Acrylic Epoxy Lacquer Paints.  In the modeling arena, people only know either Lacquer, Enamel, or Acrylic paints, and seeing a paint type like Acrylic Epoxy Lacquer was a bit of a stretch.  In one such forum, one even told me to make up my mind if I was using either Lacquer or Acrylic because that person couldn't quite accept having both in the same paint (even after showing the label), and another one even said that "Epoxies" are two part glues that can't be added in spray can paints. One thought that it might just be regional naming conventions because I was living in the Philippines.  To quote him verbatim:

"Maybe It has to do with your country's use of english, As the definition of lacquer is a mixture of natural resin and pigment ( modern day we use chemicals). Comes from the Portuguese word lac, and they used it long ago as an alternative to tempera.  And I have never seen the term epoxy used like that.
 
Again I am not trying to tell you your wrong, as it seems like our countries must use the words differently."

The thing is, Bosny and RJ London are European formulas manufactured in Thailand.

Definitions-wise:

"1673, from Fr. lacre "a kind of sealing wax," from Port. lacre, unexplained variant of lacca "resinous substance," from Arabic lakk, from Pers. lak (see lac). The verb meaning "to cover or coat with laqueur" is from 1688."


From Dictionary.com:

–noun
1.
a protective coating consisting of a resin, cellulose ester, or both, dissolved in a volatile solvent, sometimes with pigment added.
2.
any of various resinous varnishes, esp. a resinous varnish obtained from a Japanese tree, Rhus verniciflua, used to produce a highly polished, lustrous surface on wood or the like.

It's a common misconception that the term "lacquer" corresponds directly to paint (or a paint type). Lacquer is actually a type of varnish (the other type is polyurethane, like Future, and even some acrylic varnishes) that is mixed with paints or pigments (mostly with automotive spray paints) that give finishes their lovely shine. 

Epoxy, on the other hand, is mixed with paint (or pigment) to increase its bond, its quick-drying property and overall strength. Epoxy paints are more resistant to light scratches. Hence, these types of paints actually don't need to be top coated unless you want extra protection (or that uber shine).  Epoxy is a term often associated with glue, but in itself is a resin-based "hardener."  That's why we call those two part glues as "epoxy" glues; one is the binder/glue, the other is the hardener/epoxy.  Also, epoxy can't cure sealed under pressure, and only when it get exposed to air or a certain temperature range does it start to harden.

Acrylic, in turn, is a base for pigments, much like how some paints have enamel and latex bases.  Acrylic and latex paints are water soluble and therefore can be thinned with plain  water.  Enamels are not, and require enamel thinners.

So, a Lacquer Acrylic Epoxy paint has 3 components; an acrylic-based pigment, epoxy to harden it, and lacquer to give it shine.  


Comments

  1. sir,

    i'm using also bosny in my gundam model kit... but im having problem with the white one... after using it in my model kit it thickened as if it was poured with glue... what can you suggest???

    ReplyDelete
    Replies
    1. same here. had problem with only white so far. Sprayed grey primer on my sazabi then the white. soehow bosny white eat away the primer and become pink instead,

      Delete
    2. For the clumping, it should be misted at a far enough distance. Also, Bosny Flat white and regular white are so finicky, it's hard to predict whether they would coat properly or not, but, just make sure you spray in dry and warm conditions.

      Also, the red bleeding onto the white is a common problem for most white paints. It happened with the Angelus. I have not painted white over red since then, but the solution as I have read somewhere was to prime, then coat with silver/aluminum, then white. The silver/aluminum seems to block the red tint of the plastic from bleeging into the white. I have yet to try it, though.

      Delete
  2. i used the same spray.... bosny... it looked like it was poured with glue... what can you suggest to avoid this kind of tragedy??

    ReplyDelete
  3. You might be spraying too close to the surface. Misting is most appropriate for spray cans, and spray in fast motions of short bursts. It takes a while to get used to.

    ReplyDelete
  4. Thanks for this very informative post. It cleared away my doubt about using Acrylic Epoxy.

    ReplyDelete

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