METAL SURFACE PREPARATION
Personal precautions should be taken while performing all steps in the application of PropSpeed products. Always wear protective eye‑wear, respirator or dust‑mask, plastic gloves and a paint suit.
All metal surfaces to be coated with PropSpeed must be sanded to an 80 grit profile using sandpaper. Wet or dry. In an effort not to damage the shafts and propellers, we recommend using a soft pad on a dual action (DA) sander. No sand‑blasting, bead‑blasting, wire‑wheeling or ScotchBrite of the surface is recommended. Areas the DA cannot reach must be hand‑sanded. The use of wet‑dry 80 grit sandpaper increases the sanding effectiveness when sanding by hand.
READ ALL DIRECTIONS BEFORE STARTING APPLICATION
Following the sanding process and using clean, lint‑free rags, wash all sanded surfaces initially with fresh water to remove all signs of sanding residue. Once completed, wash with "PropPrep Solution" until completely clean. Change rags frequently as they become soiled. It is recommended that while one person is applying the "PropPrep Solution" another follows immediately behind rinsing with fresh water and clean rags. A five‑gallon bucket filled with fresh water will work well for this process. DO NOT allow the "PropPrep Solution" to dry on any portion of the underwater gear. If allowed to dry, reapply the "PropPrep Solution" and immediately rinse with fresh water.
REMOVAL OF OLD PROPSPEED
Remove as much as possible of the old PropSpeed coating, using a metal scraper in conjunction with a fine grinding wheel. Clean all surfaces liberally with xylene or acetone, ensuring all silicone has been removed.
Sand surface to an 80 grit scratch pattern utilizing a D.A. or by hand. Clean surface with "PropPrep" Solution as described. Continue with solvent cleaning as described below.
a final prep and drying agent, wipe all sanded surfaces with denatured alcohol, or acetone, and clean rags. At this stage of the surface preparation, the rags used should show no signs of contamination. If contamination is still evident then repeat previous instructions.
APPLYING ETCHIG PRIMER
The solids in the Etching Primer Base will settle and attach to the bottom of the can. You must scrape the bottom of the can with a wooden stir-stick until all solids are no longer attached. Then, stir the Etching Primer Base until all the material is uniformly blended (2 to 3 minutes)
Now, you are ready to add the Etching Primer Base to the Primer Catalyst in a 4 to I ratio. Stir for 2-3 minutes, and let sit for 2 minutes. To ensure an accurate mixture, it is recommended that all Etching Primer Base and Catalyst be mixed at one time.
Apply one, uniform, thin coat of Etching Primer with a brush or a foam roller. Do not allow any drips, sags or holidays.
As the Etching Primer begins to dry, it exhibits a "blotchy" look that gives the appearance that portions of the surface are unequally primed. This is a normal appearance. It is not necessary to apply additional coats of etching primer to these areas.
As the Etching Primer becomes tack‑free (usually within 3 minutes at 80°F & 85% R.H... cooler temperatures will prolong the re‑coat time) you must immediately apply the "Clearcoat." Tack‑free is considered to occur when the primer can be touched with an index finger and an impression is made in the wet primer of the finger‑tip; however, there is no primer transferred to the finger‑tip. If there is an unavoidable delay in the application of the "Clearcoat," it is recommended that an additional coat of Etching Primer be applied. The recoating of a primed surface with a subsequent coat of primer can take place for up to 7 days without the need to sand the surface. However, the surface must be clean and free of any atmospheric pollutants or foreign matter. This can be accomplished with either denatured alcohol or acetone. After 7 days the existing primer coat must be removed.
Apply one medium coat of the "Clearcoat” with a new, clean brush. Do not use a foam roller. Due to the etching primer's fast drying characteristics it is recommended that while one person is applying the etching primer, another person follows approximately 3 minutes behind applying the "Clearcoat". Allow the "Clearcoat" to cure for at least 8 hours before launching. Be sure to brush‑out any sags, drips or runs within 15 minutes of completing the application.
• When applying the "Clearcoat," be sure to stretch the material out, just as you would apply your last coat of varnish on any bright‑work.
• We recommend that one person apply the Etching Primer, and another person apply the "Clearcoat."
• After you have completed the "Clearcoat" application stage, visually observe all areas, ensuring there are no misses or gaps. The "Clearcoat" will dry to a glossy finish, helping the applicator find any uncoated areas.
Pictured below are the recommended tools and personnel safety items needed for a PropSpeed application.
PROPSPEED COVERAGE RATES
PROPELLER DIMENSIONS KIT SIZE
UP TO: SET OF 23" PROPELLERS 200 ml
UP TO: SET OF 24" to 42" PROPELLERS 1/2 liter
UP TO: SET OF 43" AND LARGER PROPELLERS 1 liter
For a single propeller vessel a 200 ml kit will cover one 34"‑ 4 bladed propeller. A 500 ml kit will cover a 60" ‑ 4 bladed propeller.
Due to the numerous shaft diameters and their lengths, it is recommended that the applicator contact PROPSPEED USA for further material recommendations regarding estimating the correct amount of required materials.
However, here is as an example of how much PROPSPEED would be required to coat all of the running gear on the new Bertram 54 sport‑fisherman, of which would include the propellers, shafts, struts, trim tabs and rudders: 1 liter kit.