Gelcoat Stains

on my AC drains, i use clear 1/2" hose, sticks out maybe 3/4". works good....

I use the same. Clear silicone holds them in place all season I and have them come out about 1 1/2”. You can’t really see them when the boat is in the water unless you look for them.
A roll of the tubing cost me about 5 bucks at Home Depot and it will last for many years.
I pull them out when the boat comes out of the water so I can back flush and winterize the AC units by pushing Antifreeze in backwards, then put new ones in before splashing again in Spring.
 
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on my AC drains, i use clear 1/2" hose, sticks out maybe 3/4". works good....
Used those with great success on my 340 and 410. Most of the stains cam from the AC pans. Now I'm spoiled with the common drains on the 58...no more multiple thru-hulls, just one on each side below the bottom paint line.
 
Used those with great success on my 340 and 410. Most of the stains cam from the AC pans. Now I'm spoiled with the common drains on the 58...no more multiple thru-hulls, just one on each side below the bottom paint line.

I’ve been using them on the AC discharges on the starboard side. Next year I’m going to do the same on the sump discharges on the port side.
If the tubing wasn’t clear my boat would start to look like a porcupine.
 
Does the flow diminish once your boat hits about 40 years old? Been thinking of the dripper gaurds, myself.
 
Lysol blue toilet bowl clear with water get rid of yellow, 50/50 mix
 
We hauled the boat for the season earlier this week. We get a film that forms on the hull directly above both A/C discharge ports, we have seen this before but not as bad as this year.
I was able to get rid of them, but only by compounding the 2 areas, nothing in the way of cleaners that I had at the boat touched it. Had to go back the next day with my buffer and compound. Wondering what product others use to clean that off?
Anybody know what causes it?

Rear a/c discharge is on the bottom. Notice how there is a drip line down through the stain from the shower sump discharge port, as the stain is building over time, the drip must keep it washed off. Nothing I tried washed it off.
View attachment 75725

Forward a/c discharge.
View attachment 75726
I get the same stain, even with two brand new a/c units. 50/50 of vinegar and water plus scrubbing eliminated mine and I used the clear tubing as well, all good!!
 
I get the same stain, even with two brand new a/c units. 50/50 of vinegar and water plus scrubbing eliminated mine and I used the clear tubing as well, all good!!

I use the tubing on the discharges coming out of the AC units. They work fantastic!
Next season I’m going to use them on the discharges for the sumps. My AC drip pans drain in to the sumps along with the showers.
 
Also clean the unit with barnacle buster and that will help

Cleaning the unit with barnacle buster doesn’t do anything for water stains below the discharges around here. It’s the water itself that stains the hull.
Plastic tubing or other devices designed to direct the steady flow further from the hull are the only way to avoid the staining that I’ve found.
 
Cleaning the unit with barnacle buster doesn’t do anything for water stains below the discharges around here. It’s the water itself that stains the hull.
Plastic tubing or other devices designed to direct the steady flow further from the hull are the only way to avoid the staining that I’ve found.
YUP, +1
 
I tried all kinds of stuff for stains to no avail. Finally tried this stuff and it actually works and works awesome.

I found it at Home Depot but it looks like Walmart has it too. It's the only thing I've used that will get those brown stains off the hull just above the water line.

ZEP Commercial Grade

https://www.walmart.com/ip/Zep-Commercial-Grade-Toilet-Bowl-Cleaner-32-Oz/23795014?wmlspartner=wmtlabs&adid=22222222222025406245&wmlspartner=wmtlabs&wl0=e&wl1=o&wl2=c&wl3=10356925614&wl4=pla-4578366452635039:aud-807612880&wl5=&wl6=&wl7=& wl10=Walmart&wl12=23795014_10000003254&wl14=Home depot toilet bowl cleaner&veh=sem&msclkid=be543850b3e11abf1f8a65aac817b84f
 

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