John
Let's see..
Laquer is easy to spray, but is brittle. Even the smallest rocks will chip
the paint. Laquer will also fail faster if there is any oil canning. This
is probably the least expensive paint system.
I used a catalyzed enamel on my RV. There are several good choices out
there. Some are single stage paints and some are two stage (i.e. you clear
coat them). The two stage paints tend to add a little weight due to the
extra coat of material. Enamels (particularly the catalyzed ones) hold up
well to chemical and phyisical abuse. This is a mid-priced paint system.
These products have top notch gloss and color retention. These products are
somewhat flexible, and will hold up to oil canning and flexing much better
than laquer.
Polyurethanes have the best gloss and color retention, and are more
chemically resistant than the other products. Polyurethanes are very
flexible, and are the least likely to crack when used on surfaces that flex
or oil can. They are the most expensive solution.
All of these are generalizations, and are subject to proper mixing and
application of the paint type. Also, there are high and low quality brands
of each of these types of paint. Earl Scheib ain't spraying the same poly
paint that goes on at the Porsche factory...
Here's a link that I googled up. It might give you a better idea of the
difference between catalyzed enamel and poly paints. Personally, I think
those are the only two alternatives that make sense today.
http://www.montanabigsky.com/bigsky.htm
No affiliation, and I've never used their products, but the product
descriptions are informative...
KB
Dan
Hope this helps.
Jay Markland
Dayton Ohio
On fabric, I prefer dope, as it is easy to work and easy to touch up. On
metal, I prefer either polyurethane or catalyzed acrylic, as they are
far more durable than enamel or lacquer. I would not use lacquer on
metal, as it has far inferior chip and crack resistance and durability.
You CAN touch up orethane and catalyzed acrylic -- it takes some effort,
but both CAN be sanded and rubbed to look like hand-rubbed lacquer --
all it takes is elbow grease.
--
Remove _'s from email address to talk to me.
I have no experience with any two part other than poly, but I really do like
poly for the durability. The big thing I want to tell you is that you have
to use great care to protect yourself while spraying poly. It contains
isocyanyde, and can cause permanent liver and nervous system damage.
A mask, or respirator will not filter out this bad stuff. You need a forced
fresh air breathing system. I home brewed one for less than twenty bucks.
Don't shy away from poly because of this. It can be taken care of, quite
easily, and the finish is worth it. There also is a flexible additive that
can be added, but that is not necessary, for metal; just true plastic.
--
Jim in NC
If you are interested in following the detailed progress of an RV-6 building
project see www.rvproject.com/index.html
I too have been wrestling w/ the question of priming and painting and have
concluded "primer" above and "wingsnaprop" below have it right.
Also, Kitplanes magazine (April & May, '05) address painting and spray
booths
"John S" <jgswa...@earthlink.net> wrote in message
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The best time to visit these places is during the middle of the work day
when the countermen might be less busy. They may not sell to you anyway
because Imron is supposed to be "for the trade only" because it's
dangerous........ as are the other "industrial coatings."
When you ask about the choice of colors they'll say, "we can match any color
you want".... and point to a book about 3' long divided into sections by car
maker. Don't expect color samples to take home with you, unless they can
find a Dupont brochure (it's in a dusty box up near the rafters) and unless
you are willing to buy it for $20., which I did.
Do expect to be baffled by them rattling off the parts numbers of all the
different cans & bottles of "stuff" that you might need for cleaning,
prepping, finishing, etc.
Don't expect to get the painting equation psyched-out on the first visit to
your "industrial coating" source.
When (if ever) I get to the stage of painting, Imron seems to be the best
way to go.
While on the subject of Imron........ The Green River killer was a painter
at Kenworth Trucks in Seattle. Flecks of Imron on some of the victims helped
to nab Gary Ridgeway.
"larsen-tools" <larsen...@cox.net> wrote in message
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MJC
"John S" <jgswa...@earthlink.net> wrote in message
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