Interlux Antifoulant on Metal Outdrives, Keels and Centerboards

Interlux Boat Painting Guide

Outdrives, Underwater Metals & Keels

Outdrives are built out of aluminum. This presents compatibility issues with cuprous-oxide containing antifoulings. Similarly, propellers are typically made with aluminum, stainless steel or bronze. Keels are made of iron, steel or lead, or cast iron.

It is important to establish the construction material of the metal you are working on. In particular, the keel needs to be treated with great care when preparing to keep it durable and free from corrosion.

THERE ARE 2 CRUCIAL ISSUES TO CONSIDER WITH ALL UNDERWATER METALS:

1) SUBSTRATE PREPARATION
The key to protecting your underwater metals from corrosion is correct preparation of the substrate, and choosing the best priming solution for your project. The first step is to determine what metal your substrate is, then to look up which products are compatible with the substrate in the table below.

2) ANTIFOULING SOLUTIONS
The second step is to simply choose your antifouling solution. Two rules should be followed:

- Never apply an antifouling containing cuprous oxide to aluminum e.g. outdrives, hulls

- Choose a hard, durable antifouling that will stand up to the wear and tear in these difficult areas.

PAINTING OUTBOARDS & OUTDRIVE UNITS BELOW THE WATER
1.	Clean thoroughly with Thinner 216. Sand the surface with 80-grit sandpaper or coarse emery cloth.
2.	Prime bare spots with Viny-Lux Primewash 353/354.
3.	Apply 2-3 coats of Primocon® Aerosol.
4.	Apply Trilux 33, Tri-Lux® II or TriLux® Prop & Drive.
FAIRING AND PAINTING METAL KEEL AND CENTERBOARDS                lead, cast iron and steel
1.	Degrease the surface with Interlux Solvent Wash 202 or Special Thinner 216.
2.	Bring metal to a uniform bright finish by sandblasting with non-ferrous blast media such as clean silica sand or, if blasting is not possible, grind using a 36 grit wheel. Remove blast or sanding residue with clean air or a broom.
3.	Within one hour or blasting or sanding apply the first coat of InterProtectI® 2000E/2001E. If more than one hour has passed, apply one thin coat of Viny-Lux Primewash 353/354 thinned 25% with Vinyl-Lux Solvent 355 prior to the application of InterProtect®
4.	If fairing is necessary, fair surface using Watertite YAV135. Sand Fairing Compound until desired smoothness is reached.
5.	Apply four additional coats of Interprotect® 2000E/2001E and follow with antifouling paint.
PAINTING UNDERWATER METALS Such as bronze and stainless steel, shafts, struts, props, trim-tabs and thru-hull fittings. The painting of these areas requires special attention to initial surface preparation in order to improve adhesion. The longevity of this system will probably not be equal to that of the remainder of the boat, due to the abuse and RPM's these parts withstand. However, excellent results have been obtained utilizing the following system.
	PAINTING TRIM TABS, SHAFTS, STRUTS, PROPS AND THRU HULL FITTINGS.
1.	Degrease the metal surface with Fiberglass Solvent Wash 202 or Special Thinner 216.
2.	Bring metal to a uniform bright finish by sandblasting with non-ferrous blast media such as clean silica sand or grind using coarse to medium emery cloth. Remove blast or sanding residue.
3.	Apply one thin coat of Viny-Lux Primewash 353/354 thinned 25% with Viny-Lux Solvent 355.
4.	Allow Viny-Lux Primewash 353/354 to dry a minimum of one hour but no more then 24 hours and apply four coats of Interprotect 2000E/2001E following dry times on label. (If fairing is necessary, fair between first and second coats of Interprotect).
5.	Apply 2—3 coats of Interlux antifouling paint. Hard antifouling paints work best such as Fiberglass Bottomkote® or Ultra for this application. On aluminum use Trilux 33, Trilux or Tri-Lux II.
Note:	If dry times for Interprotect® cannot be followed use the following alternate system. Apply four coats of Primocon YPA984 over the Viny-Lux® Primewash 353/354. On rivets and weld seams apply a minimum of five coats. Finish with at least three coats of antifouling paint. When painting aluminum use Trilux 33, Tri-Lux II Trilux Prop & Drive or Trilux antifouling paints.

WARNING: Do not apply antifouling paints over topside finishes,
to prevent reaction.

To learn more about interlux paint visit www.yachtpaint.com

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