As is the case with all surface coatings the preparation of the surface to be coated for the application of Propspeed is key. The old Propspeed coating needs to be removed completely before the new system can be applied.
Any previously applied Propspeed on propellers, rudders and drive shafts should be high pressure cleaned, removing all marine foul from surfaces, then be allowed suffi cient time to thoroughly dry.
Propspeed can be removed by sanding using 80-grit sandpaper. A dual action or air driven sander can be used and diffi cult areas wet sanded by hand.
Once the surface to be coated has had the old Propspeed chemically or mechanically removed its now time to clean the surface with the Propclean solution.
From this stage of the application forward there should be no direct hand contact with the areas that are to be coated with Propspeed. The reason for this is that the oils on your fi ngers and hands will be transferred to the surface that is to be coated and this may cause the coating to fail. Plastic or latex gloves should be worn at all times. If you need to change gloves frequently then do so. Make sure you have an abundance of rags on hand for the next two steps.
Clean the surface with Propclean. Immediately wipe the surface with a clean dry rag. Repeat until there is no residue left.
Apply Propprep solution liberally with a clean rag or use the Propprep wipes. Immediately wipe the surface with a clean dry rag to ensure no residue is left.
Propprep is essential in the chemical preparation of the metal substrate to be coated with Propspeed. It contains ingredients that react with the metal creating a surface porous layer. This porous layer is key to ensuring penetration and completion of the self etching reaction of the primrr to the metal substrate. Propprep also ensures that no free alkalinity, as a result of various soap/detergent washing, is present to interfere with the self etching primer reaction and adhesion to the metal substrate.
Ambient temperature has an effect on the application of Propspeed and the drying times of the Metal Etching Primer and the Clear Top Coat. We recommend a minimum temperature of 5°C or 40°F. It is recommended to avoid applying the product in direct sunlight or humidity above 85%.
Open the can of etching primer. The yellow pigment in the bottom of the can must be thoroughly mixed before adding the etching primer hardener. This can be done quite easily using a mixing stick or Propspeed Paint Stir Wheels. This usually takes no more than two or three minutes.
Before applying the clear coat take another paint stick and stir the clear coat so you have a smooth, homogeneous mixture in the can. The 3 to 5 minute wait between coats applies here too – use the dry to touch test to check if the etching primer has dried suffi ciently before applying the clear coat. Apply the clear coat with a brush only, NO foam roller application is to be used here. The clear coat is applied and brushed much like conventional varnish. As with the etching primer to access all parts of the propeller and shaft we recommend turning the prop using a brush, wooden stick or gloved hands.
Make sure there are no heavy runs or sags in the clear coat. You’ll have anywhere from 5 to 10 minutes to touch these up. Any drips that harden on the edges of the propeller blades can be carefully cut off the following day.