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WakeWorld Discussion Board » >> Boats, Accessories & Tow Vehicles Archive » Archive through November 17, 2003 » Removing waterline stain from gelcoat « Previous Next »
By Pat Frist (qwert1420) on Monday, August 18, 2003 - 5:39 am:    Edit Post Delete Post
I moored my MC at a marina with some nasty water (algae and other crud) for a week. After pulling the boat and cleaning, there still is a stain at the waterline. Does anyone know how to remove this from the gelcoat?
By Tom Adrian (tommyadrian5) on Monday, August 18, 2003 - 5:53 am:    Edit Post Delete Post
FSR, its really foul stuff, wear gloves, but its simple (wipe on spray off) and will have your hull looking like my white ass

By Mitch Mansfield (mitchm) on Monday, August 18, 2003 - 7:09 am:    Edit Post Delete Post
I use on/off. It's available at any marina. Nasty stuff as well. Gloves!
By Rod McInnis (rodmcinnis) on Monday, August 18, 2003 - 9:24 am:    Edit Post Delete Post
There is also a fiberglass hull cleaner made by Starbright.

Like the others said, nasty stuff! It is basically oxallic acid. Wipe it on, wipe it and the stain off. Don't breath while you are doing it though!

I got it on my hands and didn't have any adverse reactions, but then I wash engine parts in paint thinner and be none the worse for the wear. If you have any skin sensitivity at all, wear rubber gloves. This stuff amazed me at how easy it was to use. You know those oven cleaner commercials, where they just spray it on and the oven wipes clean? Well, I have never had my oven clean that way, but the bottom of my boat sure did!

By collin (collin) on Monday, August 18, 2003 - 9:50 am:    Edit Post Delete Post
Sno-bol. Works like a charm
By NoneYa (noneya) on Monday, August 18, 2003 - 11:25 am:    Edit Post Delete Post
MeGuires makes a hard water spot remover, works great.
By Pat Borowski (bambamski) on Monday, August 18, 2003 - 12:47 pm:    Edit Post Delete Post
Heavy duty toilet bowl cleaner
By andrew zarlengo (colorider) on Monday, August 18, 2003 - 1:37 pm:    Edit Post Delete Post
McGuires oxidation remover. !!!!!!!!!!!!!! Safe on gelcoat and works great on the water scum. Rub on, rub off.
By Monster Tower (monstertower) on Monday, August 18, 2003 - 3:42 pm:    Edit Post Delete Post
Flitz ( is great for little stuff and great to keep a tube on the boat but a little pricy if you have a lot of real estate to clean.
By muji (mujibur) on Monday, August 18, 2003 - 7:47 pm:    Edit Post Delete Post
if you can get the boat back into the water for a few days and let it sit, the skum comes back, but once it does grab some terry cloth towels, a snorkel mask and a snorkel - jump in and spend 20 minutes wiping the crud off WHILE THE BOAT IS STILL IN THE WATER. It sounds crazy, but it has worked for me for years. Use the acid on the small remaining spots and use it sparingly.
By Chris Molidor (cdm) on Tuesday, August 19, 2003 - 2:19 pm:    Edit Post Delete Post
I like Iron Out! I use a cheap foam mop with extention, fill bucket with hot water and dump Iron Out in until it foams, stir, and apply. Spray off with the hose. No FUSS! No Gloves.
By Funkster (isaac_d_funk) on Tuesday, August 19, 2003 - 8:32 pm:    Edit Post Delete Post
I just tried the sno bol stuff and it works great. I used a spray bottle then let it sit on for about 10 min then washed it off with hot soapy water. It works like a charm,best $2.00 I have spent in along time!!
By Jon Mitchell (jon43) on Monday, August 25, 2003 - 1:23 pm:    Edit Post Delete Post
you can go to home depot and get this stuff called 505 in a spray bottle no joke works better than any thing Ive ever used and a bottle of it is only about 3 bucks}}}
By Kailua Al (kailua_al) on Tuesday, September 02, 2003 - 12:19 pm:    Edit Post Delete Post
Based on the first post by Tom Adrian, I tried the FSR this past weekend. It worked great! Like Tom says, wipe on, spray off! Not sure if it is white as his behind, but it is definitely white as it once was!
By Tom Adrian (tommyadrian5) on Tuesday, September 02, 2003 - 1:03 pm:    Edit Post Delete Post
i'm tellin you my ass is really white
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