Propspeed Guru - Removal of Old Propspeed
How do you remove old Propspeed? We've got the answers from our very own Propspeed Guru!
There are multiple ways to remove old Propspeed before beginning your application, some easier than others. Starting with the harder option, any previously applied Propspeed on propellers, rudders and drive shafts should be high pressure cleaned, removing all marine foul from surfaces, then be allowed time to sufficiently dry. Propspeed can be removed by sanding using 80-grit sandpaper. A dual-action or air driven sander can be used, with difficult areas wet sanded by hand.
The easier option is to use Propstrip. This is a completely safe, low-toxicity remover that is water neutralized. First, it is important to make sure the area you are working with is completely dry, as water de-activates Propstrip completely. Depending on the remaining wear of the silicone topcoat the Propspeed may first need to be abraded with 80 grit sandpaper. This will help the Propstrip to be more effective as it will penetrate the silicone faster. You can then go ahead and apply the Propstrip liberally with a brush.
In cold conditions, for example, 10-15 degrees Celsius or 50-60 degrees Fahrenheit, it could take up to 3 hours to release the Propspeed, or longer if even colder. In hot conditions, such as above 35 degrees Celsius or 95 degrees Fahrenheit you may need to ensure the treated area is in shade to prevent the Propstrip from drying out. Propstrip will work faster in hot conditions, so within 1 to 3 hours, you should begin to visually observe the discolouration of the old Propspeed.
Once the Propstrip has started to bubble and change colour, you can test a small area with a scraper to see if it will easily release from the substrate. If it does, wash the area with a hose or a bucket of water and a Scotch-Brite pad.