The Gougeon Brothers on Boat Construction - WEST SYSTEM Epoxy

<strong>The</strong> <strong>Gougeon</strong> <strong>Brothers</strong> On Boat Construction 373
Be sure epoxy has cured thoroughly. Make a test panel
to assure compatibility.
Epoxy paints are available in one-part and two-part
versions. Two-part epoxies offer many characteristics
similar to the higher performance polyurethanes. <strong>The</strong>y
are durable and chemical resistant, but offer limited UV
protection compared to the linear polyurethanes.
Two-part linear polyurethane (LP) paints offer the
most durable protection available. LPs are available as
pigmented or clear coatings and offer excellent UV
protection, gloss retention, abrasion resistance, plus
compatibility with epoxy. However, compared to other
types of coatings, they are expensive, require more skill
to apply, and present a greater health hazard, especially
when sprayed.
Bottom paints are available in a variety of formulations.
Most bottom paint systems are compatible with epoxy
and can be applied directly over a prepared epoxy
barrier coat. If you are unsure of compatibility or have
curing or adhesion problems with a specific bottom
paint, use only a primer recommended for that bottom
paint over the barrier coat. Follow the recommendations
given for preparation of fiberglass surfaces. Other
paints, including marine LPs and primers, are not
recommended for use below the waterline.
Primers are usually not needed to help a paint film
bond to epoxy, although interfacing primers may be
required with some specialized bottom paints and highbuild
primers are useful for hiding scratches or flaws in
the substrate. If the instructions on your paint or
varnish recommend a specially primed surface, follow
the recommendations given for fiberglass preparation.
Self-etching primers do not work well on an epoxy
coating because of epoxy’s chemical resistance.
Follow all instructions from the coating systems
manufacturer. It is a good idea to make a test panel to
evaluate the degree of surface preparation required, and
the compatibility and handling characteristics of the
finish system.