How do i get this out?

[gman546]

No matter what i do i cant get these what look like to be either spider poop or bird poop marks out of my gel coat. i sit there with marine spray 9 over and over and its like its baked into the white gellcoat. Lake erie. do others have this issue? what do you do?

 

[flashback]

Wet sand it with 800- 1000 grit sandpaper and then buff with a good buffing compound.

 

[Scott Danforth]

get some oxalic acid (wood bleach) and mix it up

most hull cleaners have oxalic acid.
most toilet bowl cleaner have oxalic acid.

 

[tpenfield]

I keep a bag of oxalic acid on the shelf for cleaning mineral and iron stains.

 

[redneck joe]

how is that acid in the water from overspray?

 

[tpenfield]

how is that acid in the water from overspray?

Minerals in the water . . . acid to get rid of it.

 

[DeepCMark58A]

Go to $ general buy toilet bowl cleaner, just like a toilet apply and let soak may take two applications but the stains will be gone.

 

[Scott Danforth]

how is that acid in the water from overspray?

Oxalic Acid is made from Rhubarb.

its a naturally occurring acid, just like oranges and tomatoes

Go to $ general buy toilet bowl cleaner, just like a toilet apply and let soak may take two applications but the stains will be gone.

sno-bowl cleaner used to be the go-to.

however I have been buying oxalic acid in powder form to mix up for rust removal for the past 15 years.

https://www.amazon.com/s?k=oxalic+acid

 

[redneck joe]

Oxalic Acid is made from Rhubarb.

its a naturally occurring acid, just like oranges and tomatoes

rhubarb? Cool...

but as a child of the 70's remember acid rain? Too much of something natural isn't always good and yes i know acid rain was not 'natural'. My pee is natural but too much kills plants. Ask my outdoor pee bush by my shed and it will agree with me...

 

[bakerjw]

It also comes from shamrocks and plants in the genus Oxalis. Ever eat a shamrock? Sour. That is the acid.

 

[redneck joe]

i ate lots in my youth so i guess that means i was on acid...

 

[Captain Caveman]

My pee is natural but too much kills plants. Ask my outdoor pee bush by my shed and it will agree with me...

Have you tried eating plant food? It might help the bush.

 

[gman546]

UPDATE: Got the boat out, powerwashed 3 coats of spray nine bottom cleaner and this is whats left. I've got the Oxilic acid as suggested, but also wondering - I've heard of guys using fast orange hand cleaner and toilet bowl cleaner. What's the best at getting this stuff gone that's remaining?

 

[Scott Danforth]

toilet bowl cleaner contains oxalic acid

 

[redneck joe]

^^what he said^^

 

[MikeSchinlaub]

Fast orange has pumice in it. You will be scrubbing the stain off and scuffing the gel. It would be dulled when you finish.

It works great for glass stove tops though.

 

[JustJason]

As others have oxalic acid, but, cover the hull with hit and then hit it with wet rotary buffing pad on low, and then spray it all off. Wear eye protection.

 

[JonBoat55]

StarBright hull cleaner

 

[Texasmark]

rhubarb? Cool...

but as a child of the 70's remember acid rain? Too much of something natural isn't always good and yes i know acid rain was not 'natural'. My pee is natural but too much kills plants. Ask my outdoor pee bush by my shed and it will agree with me...

One of my granddads had a small farm and liked for me to help him plant when that time would come. On one occasion we were heading back to the house for lunch and he stopped at 2 Dill plants. He took a whiz on the tall one. Said he was fertilizing it......must have been as it was about twice as tall as the other one.

 

[Scott Danforth]

StarBright hull cleaner

contains oxalic acid