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Ask Joe Powder
"Ask Joe Powder" is a question and answer column authored by Kevin Biller of
the Powder Coating Research Group. Mr. Biller has over 30 years experience
formulating and manufacturing powder coatings. He welcomes your questions
regarding powder coating technology. Please write to: email@example.com
The Powder Coating Research Group
15 W. Cherry Street, 3rd Floor
Columbus, OH 43215
We are in the process of establishing an assembly plant here in South
Africa. One of the topics on my agenda is the question regarding the
Can an e-coated vehicle shell (body) be shipped overseas and painted at the
destination? If so, what would the processes be to implement something like
this i.e. paintshop
Deon J. van der Merwe
General Manager Assembly Operations
Naledi Assembly Plant of RSA (PTY) Ltd
Indeed this process is quite feasible. In fact it is a very good idea. It
would be essential to thoroughly clean and prepare the electrocoated surface
before applying the next coating. You would need to clean the surface to
remove any soils deposited during transit and handling. A simple alkaline
cleaner followed by a tap water rinse then a deionized water rinse should
suffice. Sufficient drying before the next coating is applied would be the
final step. This will provide a clean surface that will readily accept a
Please let me know if I can be of further assistance.
Hi Sir, How r u?
I need your help.......... What type of chemistry one should use for below
absolute temperature i.e. 0°C up to -30°C? Should I go with Pure Polyester,
or Hybrid? Will Super Durable PP work? Or should I go for some higher
percentage of resin, around 80%? Please Reply when you get time.
Rahul Dusane, Mumbai-Nashik, India
I would start with a 50:50 hybrid with minimal (but some) filler such as
blanc fixe or perhaps mica.
Is there a gloss or colour specification? A 50:50 (polyester to epoxy)
hybrid will provide toughness,
adhesion and thermal stability at a relatively low formulation cost. I would
be careful not to incorporate too high a concentration of filler. Some
filler is good, however excessive amounts will compromise flexibility,
toughness and corrosion resistance.
It is a glossy and semi-glossy. Could not I use PP Super Durable? Sir, I
want to request to you about some literature which relates to powder coating
formulation, which will help me to get me help in resin and filler
selection. Thanking you.
The 50:50 hybrid still makes the most sense. It can be formulated easily in
a gloss or semi-gloss product and will provide the best flexibility and
toughness for the price. Super-durable polyesters provide excellent
resistance to sunlight and intense UV radiation. They typically possess
significantly less flexibility than other powder chemistries including
epoxy, hybrid and pure polyester types.
As for a really good book on powder coating formulation I recommend: Powder
Coatings Foundation for the Novice Formulator, BNP Media, 2004. You can
order it at: this link