DynaSeal™ UV Hybrid Sealer beats the
heat in curing plastic car parts.
A new solution to a costly production problem.
UV Hybrid Sealer is used on the rear quarter panels of
the Ford F-150 four-door truck, shown here in front of
the OEM Coatings Application Research Center in Southfield,
Many of today's cars and light trucks feature
body panels made of a molded fiberglass composite that must be painted.
However, the cured fiberglass parts are porous and absorb moisture
and solvents during the painting process. Subsequently, the heat
of a conventional paint curing process stimulates "outgassing"
of these absorbed volatile materials, which causes unacceptable
defects, called "pops", in the finish. The result: A high
part rejection rate, which slows production, increases repair costs
and generates undesirable gaseous emissions.
Now there's a product that not only eliminates
defects caused by outgassing, but offers dramatically improved production
efficiency: BASF's DynaSeal™ UV Hybrid Sealer. This innovative
coating, developed by BASF's Automotive
OEM Coatings Regional Business Unit, makes possible a process
that combines the virtues of conventional thermal curing with the
proven technology of ultraviolet, or UV, curing.
"Thermal curing and UV curing each offers
advantages for a manufacturer of molded automotive parts,"
says John Gilbert, Technical Manager, Automotive OEM Coatings. "Heat
curing, for example, enhances paint adhesion and improves resistance
to the effects of chemicals, small projectiles and weathering. UV
curing, on the other hand, is much faster and more efficient, with
fewer volatile emissions and lower energy costs.
"The challenge for our team," says
Gilbert, "was to develop a sealer that can be applied to a
molded part and then cure the paint film almost instantly by UV
light to seal the porous fiberglass. This prevents "outgassing"
of absorbed volatile materials -- and the defects it causes -- when
subsequent paint layers are applied and cured by heat."
According to Gilbert, a major automotive parts
supplier has used the new sealer since May 2001. DynaSeal has eliminated
defects caused by outgassing and has dramatically improved production
T. J. Lepkowski, Product Marketing Manager,
was part of the R&D team that developed and launched the DynaSeal
product. "This is an excellent example of an innovation that
has made a key manufacturing process better," says Lepkowski.
"BASF's DynaSeal has set the standard for UV-cured automotive
coatings, and its success means that other suppliers will be pressed
to develop such coatings in order to meet future manufacturing demand."
DynaSeal is a trademark of BASF Corporation.