How to apply Propspeed


Propspeed is a foul release coating system designed and proven to prevent marine growth from bonding to metal surfaces below the water line.

1

Metal surface preparation – sanding the surface

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 sufficient 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 difficult areas wet sanded by hand.

Watch the Propspeed video

1

Metal surface preparation – Propstrip

Make sure the area you are working with is totally dry: Propstrip DOES NOT like any moisture. Water de-activates the Propstrip completely.

Ensure any areas that are not being treated are adequately protected from Propstrip.

Dependent on the remaining wear layer of the silicone topcoat the Propspeed may first need to be abraded with 80 grit sandpaper.

Apply Propstrip liberally with a brush ensuring there is a thick coating on 100% of the surface being treated allowing for complete saturation of the part.

In cold conditions, 10-15°C or 50-60°F, it could take up to 3 hours to release the old Propspeed or if colder, it may take longer than 3 hours.

In hot conditons above 35°C or 95°F it may be necessary to position  the treated area in shade to prevent the application from drying out while performing its action. The product works faster in hot conditons, so within 1 to 3 hours you should begin to visually observe the discoloration of the old Propspeed.

When the product has started to bubble and change colour, this is a good sign that it is doing its job. Test a small area with a scraper to see if it will freely release from the substrate. Once ready, wash with a hose or a bucket of water and a Scotch-Brite pad.

Any remaining product is removed using a wet Scotch-Brite pad or wet/dry sandpaper.

Propstrip Flyer Download (885 KB)

Watch the Propstrip video

2

Initial clean – using the blue Propclean wipe

Once the surface has had the old Propspeed chemically or mechanically removed it’s time to clean the surface with the Propclean wipe provided.

Clean the surface with the blue Propclean wipe. Immediately dry the surface with a clean, dry, white cotton rag. Repeat until there is no residue left on the cotton rag.

3

Metal conditioning - using Propprep

Apply Propprep solution liberally using the red Propprep wipe provided in your kit. Immediately wipe the surface with a clean white cotton dry rag to ensure no residue is left.

Propprep is acidic. Extra care should be taken when wiping the surface. The Propprep solution does not contain corrosive inhibitors, so the treated surface should be coated and primed with Propspeed as soon as possible.

You are now ready to start painting.

4

Mixing the Etching Primer

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 the mixing stick provided. This usually takes no more than two or three minutes.

Once the Etching Primer Base has been thoroughly stirred and there are no solids left in the bottom of the can you can now add the bottle of Etching Primer Hardener to the Etching Primer Base. 

5

Applying the first two coats

The application process must be well planned due to the quick re-coat times between coats. The timing of each coat is essential to enable the required chemical bonding between coats.  When applying Propspeed, be aware of the area to be coated and the recoat window. You may have to apply the Etching Primer and Clear Coat one section at a time.

The Propspeed system requires two generous coats of Etching Primer. If moving the prop, be careful not to damage the fresh coating.

When coating the blades of the propeller remember to start in the hub area and work your way out to the end of the blade. 

Once you have applied the first coat of Etching Primer wait approximately 3 to 5 minute before applying the next coat. To test if it’s ready, use the dry-to-touch test method.

6

Dry-to-touch test method

Take your gloved index finger and touch the wet Etching Primer. If it leaves a small print on the primed surface but no Etching Primer transfers to the fingertip of your glove, you can begin applying the next coat. The wait-time between coats of Etching Primer is very important and must be adhered to.  Make sure you have some idea of how time is progressing. 

7

Clear Coat

Apply a thin layer of Clear Coat with a brush only. Do not use a foam roller here. The Clear Coat is applied and brushed much like conventional varnish. Make sure there are no heavy runs or sags in the Clear Coat before moving on to another area. You will have 5 to 10 minutes to touch-up these areas before the Clear Coat dries. After completing the application of the Clear Coat, visually observe all areas, ensuring there are no misses or gaps.  The Clear Coat will dry to a glossy finish, helping you find any uncoated areas. Propspeed requires a minimum of eight hours to dry before launching. In cold climates, we recommend at least 24 hours drying.

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Propspeed is the proven foul release coating system

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