The information provided here has been reproduced courtesy of Pettit Paint Company. Wholesale Marine reproduced this information 2/22/2008.
Pettit Protect High Build Epoxy Primer 4700/4701 is a heavy-duty,
high build, two component epoxy-polyamide coating for use where
maximum resistance to fresh or salt water is required. The complete
coating system is resistant to water, many industrial chemical fumes,
and very humid environments. It is ideally suited to many commercial
and pleasure craft applications and has excellent durability in exterior
exposures, although, like most epoxies, it will chalk if not topcoated.
Stir both components thoroughly. Mix the two components together
in the ratio of 3 parts of Component A to 1 part of Component B by
volume. Allow to stand 15 minutes at approximately 70 before using.
(Allow to stand at least 30 minutes if temperature if between 50
and 65F) May be applied by brush, roller, conventional or airless
spray. Thinning is not normally required for brush or roller application,
however, small amounts of 97 Epoxy Thinner may be used if necessary
to facilitate application. For spraying, use 97 Epoxy Thinner at
levels of 5-10% by volume to ensure a smooth finish with minimal
orange peel. Wet fi lm thickness should be 7.1 mils per coat, which
yields 4 mils dry fi lm thickness. A wet film thickness gauge should be
used to monitor paint application. Total dry film thickness for a three
coat application should be 12 mils minimum for maximum coating
performance. If this has not been achieved with three coats, additional
coats are recommended until 12 dry mils is reached.
Coating performance, in general, is proportional to the degree of
surface preparation. Follow recommendations carefully, avoiding
shortcuts. Inadequate preparation of surfaces will virtually assure
inadequate coating performance.
MIX RATIO (A/B)…3 to 1 (by volume)
CURING MECHANISM….Chemical Cure
By weight…..71 +/- 2%
By volume….56 +/- 2%
COVERAGE…..225 sq. ft/gal.
VOC….378 g/l max. (admixed)
METHOD…..Brush, Roller, Airless or Conventional Spray
INDUCTION PERIOD….15 minutes at 70F
NUMBER OF COATS….3 min.
DRY FILM THICKNESS PER COAT…..4 mils (7.1 wet mils)
APPLICATION TEMP (air & substrate)….. 50 F. Min. / 90 F. Max.
POT LIFE…. 2.5 hrs. @ 90F 5 hrs. @ 70F 10 hrs. @ 50F
DRY TIME (Hours)
Substrate To To To
Temp Recoat Bottom Paint Launch
90F 2 - 16 3 - 6 48
70F 3 - 18 5 - 8 72
50F 6 - 24 7 - 10 120
If these recommended intervals are exceeded, sand
thoroughly with 80 grit sandpaper before recoating
or applying bottom paint.
THINNER…..97 Epoxy Thinner
97 Epoxy Thinner
6455/044 Metal Primer
6980 Rustlok Primer
Bare Fiberglass: All fi berglass surfaces, regardless of age, should be washed at least twice with Pettit 95 Fiberglass Dewaxer. Change rags frequently to ensure complete removal of wax, mold release, or other contaminants. Sand the surface thoroughly with 60 grit sandpaper and rewash with 95 Fiberglass Dewaxer to remove sanding residue. Apply at least three coats of Pettit Protect High Build Epoxy Primer 4700/4701 following the application and recoat instructions. Finish with two coats of Pettit antifouling paint.
Refer to Pettit Technical Bulletin TB1000 Gelcoat Blister Repair and Prevention Specifi cation for
Sandblast to SSPC-SP 6 Commerical blast, blow off residue with clean, compressed air, and immediately apply
three coats 4700/4701 following application and recoat instructions. Alternatively, hand sand with 80 grit sandpaper or power hand tool clean, then remove residue with clean compressed air or by vacuuming. Immediately apply one coat of Pettit 6980 Rustlok Steel Primer and let dry to a tack free state (usually 30 minutes to 2 hours, dependent on temperature). Then apply three coats of Pettit Protect High Build Epoxy Primer 4700/4701 following application and recoat instructions. Do not let Rustlok Primer dry longer than 2 hours under any circumstances before applying Pettit Protect High Build Epoxy Primer 4700/4701.
Sandblast (using non-metallic media) or disc sand the aluminum to clean, bright metal. Wipe clean of residue and immediately apply one thin coat of Pettit 6455/044 Metal Primer. Let dry 8 hours minimum, 48 hours maximum, and apply three coats Pettit Protect High Build Epoxy Primer 4700/4701 following application and recoat instructions.
Keels - Lead:
Disc sand or otherwise abrade surface to bright metal; clean off residue. Apply one thin coat of 6455/044
Metal Primer and allow to dry eight hours. Apply one coat of Pettit Protect High Build Epoxy Primer 4700/4701. Let dry
to recoat. Then, if fairing is required, apply Pettit Protect 7000/7001 Epoxy Fairing Compound. Sand smooth with 80 grit
sandpaper and follow with two additional coats of 4700/4701 per label directions.
Keels - Steel or Cast Iron:
Disc sand or otherwise abrade surface to bright metal and clean off residue. Apply one coat of 6980 Rustlok Steel Primer, allowing to dry only .5 - 2 hours prior to overcoating, no more, no less! Apply one coat of Pettit Protect High Build Epoxy Primer 4700/ 4701. Let dry to recoat. Then, if fairing is required, apply Pettit Protect 7000/7001 Epoxy Fairing Compound. Sand smooth and follow with two additional coats of 4700/4701 per label directions.
Previously Primed Surfaces:
Pettit Protect High Build Epoxy Primer 4700/4701 may be applied over existing two part epoxy finishes, provided they are in sound condition. Brush-off sandblasting or very heavy sanding with 60 grit sandpaper is required to maintain maximum adhesion. Then apply three coats 4700/4701 per instructions. Remember, coating performance is only as good as the surface to which it’s applied. All existing two package epoxy fi nishes in poor condition, as well as one package primers and bottom paints, should be removed completely and the appropriate bare system as described above should be followed before using Pettit Protect High Build Epoxy Primer 4700/4701. Total dry film thickness is more important than the actual number of coats applied. On metal and fiberglass, if 12 mils total DFT is not achieved with three coats, additional coats are recommended until 12 mils total DFT is achieved.
This is a simplied system for smaller areas designed for good performance and easy application by the boatyard professionalor do-it-yourselfer. For larger vessels or for application where a high performance, professional system is desired,please consult your local Pettit representative or the Pettit Technical Department.