Text: Josef Blažek
I am christening a new series focusing on modelling chemistry and tips associated therewith for both beginners
and advanced modellers. We will guide you through the
world of chemistry as it pertains to model technology
from basic construction to surface treatment all the way
through to finishing and weathering. We will assume the
use of readily available materials with a certain amount
of emphasis on Mr. Hobby (Gunze) products.
The first volume of this series is dedicated to adhesives.
The question of with what and exactly how
to glue plastic models together is as old
as the hobby itself. The answers change
with the passage of time as technologies
develop and along with them, trends. Currently, we find four types of adhesives
that are front and centre in plastic model
• Solvent based adhesives
• Instant glues
• Dispersion adhesives
• Epoxy cements
The method and range of use varies and
it can generally be said that each of these
types has their usefulness. It is essential
to use the right adhesive for the right job.
Here, we’ll focus on Solvent based adhe-
sives, and so that the situation
Winner of international IPMS competitions in
isn’t too simple, even they have
Master categories and multiple Czech Repubtheir specific differences from
lic IPMS champion. Author of articles in inbrand to brand, despite our geternational magazines with worldwide reach
neral focus on Mr. Hobby pro(Military Illustrated Modeller, Cocardes Inducts. Solvent based adhesives
ternational, ModellFan, Modelář). Co-author
have no minimum film-forming
of modeling startup Plastic Invasion.
temperature (as do dispersion
types) and so no coalescence process will be observed.
After the application of the solvent, and nent evaporates, we are left with a very
its subsequent evaporation, signs of its solid and stable bond. The chemical propresence will be left behind in the form cess at work here leads to a cold weld,
of the polymer film. It is this polymer film and it is necessary to use these adhesithat, thanks to its adhesive properties, ves on materials that the adhesive is able
is responsible for the bonding of parts to etch. In other words, they are able to
together. Another type-specific effect chemically etch the material being glued.
of solvents on plastic is the etching Solvent type adhesives are not effective
of its surface. After the solvent compo- on materials such as resins (polyuretha-