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  Topic Review (Newest First)
06-14-2011 09:21 PM
Flybyknight Any acid will degrade the zinc galvanizing, so you might want to consider covering the trailer metal surfaces with plastic sheeting.

For algae, a Clorox soak followed by Dawn detergent has worked well in the past for me.

06-14-2011 08:54 PM
SJ34 Lysol toilet bowl cleaner, the gel type in the inverted squeeze bottle, works about the same as FSR but far cheaper. It's also very good at removing the stains caused by leaving bottom paint sanding dust on the deck (don't ask how I know this, I will say my neighbors Egg Harbor MY shines like a new penny).

Will second the advice to mask off the bottom paint before using this stuff. A single strip of tape rolled out slightly at the bottom (to create a drip edge) is all you need.
06-14-2011 05:41 PM
captainfun Thanks for all the comments. I have ordered some On-Off (the liquid kind) and some FSR that a local boat shop will have in a couple of days. I have had a couple of local guys tell me that they use Zing as well. I checked three local stores and no one has oxalic acid.
06-14-2011 02:04 PM
Beersmith +1 for On-Off. Stuff is magic.
06-14-2011 01:33 PM
600 grit wet/dry sandpaper

If none of the chemical cleaners work, get a bit of 600 grit sandpaper and rub a short length of waterline to see if the discoloration will come off. If it doesn't, it has penetrated the gelcoat. If it has penetrated the gelcoat, cleaning and painting is the most practical solution.
06-14-2011 01:22 PM
BBurg +1 on the oxalic acid. Available at most marine supply stores. Power or sail. Spray it on and the stuff just disappears. Light brush scrubbing and that's it. Wear eye protection and gloves. I sprayed it on with a plastic garden sprayer.
06-14-2011 01:06 PM
JimsCAL Marykate On and Off works great. It's an acid, so follow the precautions on the container. If you want to buy locally rather than drive to WM, oxalic acid from the hardware store will work also.
06-14-2011 10:31 AM
Barquito If it is above the boot stripe maybe the boat wasn't sitting on its line?
06-14-2011 10:29 AM
Barquito If it is on the painted stripe, consider just sanding it off and repainting the stripe (Brightsides or something). Mask off the top of the stripe so you don't mess up the topsides gelcoat.
06-14-2011 09:33 AM
Maren For a trailerable boat, a scrub brush and some bleach is a decent start, oxalic acid is good too but you need to be more careful. It will take a couple of goes at it to get it done fully.

Marine cleaners: Collinite (collinitemarine with the usual .com and such) That stuff really works and well. Make sure you get the wax too. A good cleaning and wax job will truly do wonders and will last about two years.

Galvanized trailer. Usually not. Spend the money on making sure the lights, wiring and tires are in good shape as they tend to be a bigger source of failure. Now, if it's really rusty, obviously you have to deal with that.

Antifouling paint. Think about how you are going to use the boat first. If it's going to sit in the water, antifouling paint is a fine choice. But if you launch and retrieve the boat each time and our out for a few hours or a few days, this really isn't worth the cost.

Hope that helps.
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