2007 190 MONTAUK Mold Forming on Silicon Sealant

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Author Topic:   2007 190 MONTAUK Mold Forming on Silicon Sealant

Whalerdog posted 07-29-2008 07:53 PM ET (US)
I have 2007 Boston Whaler 190 Montauk. The white silicone in the rear where the water lays has turned black. Looks like a magic marker in few spots. I tried most everything to remove it. I was going to go over it of cut the small area out and reseal it. What is the best kind [of sealant and best] brand [of sealant] to use? I saw 3M and the had regular and extra strength. Thanks!
Chuck Tribolet posted 07-29-2008 08:59 PM ET (US)
I'd leave it alone.

Chuck
dauntless14 posted 07-29-2008 09:08 PM ET (US)
[I] have the same problem. [I w]ent ahead and cleaned [the portions of the sealant which were covered with black mold] with acetone then applied a thin layer of 3M5200 over the existing caulk.
Bella con23 posted 07-29-2008 10:20 PM ET (US)
I had the same [problem] and found that a terry cloth rag and some boat soap worked into the caulk joint cleaned it up nicely. I don't think that the mold had a chance to penetrate the caulk, however it was black when I started.
Joe
Whalerdog posted 07-30-2008 05:20 PM ET (US)
Guess I'll rub some more with soft scrub. I did put some on overnight like a poultice. Damn spot looks just like a super marker dot. You would think they could put some kind of fungicide in the silicone to last for a few years. I wash it every five days and rinse it even more frequent. Rinse it every time out which is at least every other day weather permitting. Thanks for the help.
Jefecinco posted 07-31-2008 09:17 AM ET (US)
Prevention being useful, a cover to keep water out and a sponge to remove all traces after cleaning or use could be a problem solver.
Butch
Whalerdog posted 07-31-2008 05:43 PM ET (US)
Butch good info thanks I try my best to do that. Sometimes with work I can't look out the window I am so tired. Wish they made it drain better there. Hardly anything stays there and the boat in in the water so it does rock and remove all but a half cup or less on each side. If I had the dough I would enclose the floating dock with a fabric like car tents they sell. The dock does rattle and roll slightly so it is probably not feasible. Thanks!
chopbuster posted 08-05-2008 07:28 PM ET (US)
I watched an old-timer use an artist's small brush to paint the black mildew stain with diluted bleach and rinse with water; the stain disappeared.
Whalerdog posted 08-05-2008 08:29 PM ET (US)
Tried to scrub it again and did try commercial bleach left on over night to no avail. Got a tad lighter but it still bugs me.
jimh posted 08-05-2008 09:05 PM ET (US)
[Moved to the POST-CLASSIC discussion.]
Sal A posted 08-06-2008 05:16 AM ET (US)
Try using Amazing Roll - off. Let it sit for ten minutes. Then work it. It will work.
poker13 posted 08-08-2008 03:02 PM ET (US)
If bleach didn't kill it, it can't be algae, mold or mildew. Household bleach, like Clorox, will make that stuff disappear in minutes. I wonder what it might be.
Whalerdog posted 08-08-2008 06:54 PM ET (US)
it is some type of mold that penetrated they silicone
swist posted 08-09-2008 12:53 PM ET (US)
I've seen this on boat caulk, mainly silicone, the mold/mildew is actually forming inside the cured sealant. So putting bleach (or any other cleaner) on it doesn't do a thing.
When this happened to me on my pre-Whaler boat, it was mainly at the joints of all the pieces that made up the cockpit on a cuddy-cabin ProLine. I had to scrape out the old stuff and recaulk it. I suppose you could also caulk over the old stuff, but that wouldn't be as neat as the beads would be too big.
Whalerdog posted 08-11-2008 03:34 PM ET (US)
I caulked over it today. It is recessed quite far and it still looks neat. See if it comes back. I may spray it every day with 3M mold remover. 3M also make a mold preventive spray.

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Author	Topic: 2007 190 MONTAUK Mold Forming on Silicon Sealant
Whalerdog	posted 07-29-2008 07:53 PM ET (US) I have 2007 Boston Whaler 190 Montauk. The white silicone in the rear where the water lays has turned black. Looks like a magic marker in few spots. I tried most everything to remove it. I was going to go over it of cut the small area out and reseal it. What is the best kind [of sealant and best] brand [of sealant] to use? I saw 3M and the had regular and extra strength. Thanks!
Chuck Tribolet	posted 07-29-2008 08:59 PM ET (US) I'd leave it alone. Chuck
dauntless14	posted 07-29-2008 09:08 PM ET (US) [I] have the same problem. [I w]ent ahead and cleaned [the portions of the sealant which were covered with black mold] with acetone then applied a thin layer of 3M5200 over the existing caulk.
Bella con23	posted 07-29-2008 10:20 PM ET (US) I had the same [problem] and found that a terry cloth rag and some boat soap worked into the caulk joint cleaned it up nicely. I don't think that the mold had a chance to penetrate the caulk, however it was black when I started. Joe
Whalerdog	posted 07-30-2008 05:20 PM ET (US) Guess I'll rub some more with soft scrub. I did put some on overnight like a poultice. Damn spot looks just like a super marker dot. You would think they could put some kind of fungicide in the silicone to last for a few years. I wash it every five days and rinse it even more frequent. Rinse it every time out which is at least every other day weather permitting. Thanks for the help.
Jefecinco	posted 07-31-2008 09:17 AM ET (US) Prevention being useful, a cover to keep water out and a sponge to remove all traces after cleaning or use could be a problem solver. Butch
Whalerdog	posted 07-31-2008 05:43 PM ET (US) Butch good info thanks I try my best to do that. Sometimes with work I can't look out the window I am so tired. Wish they made it drain better there. Hardly anything stays there and the boat in in the water so it does rock and remove all but a half cup or less on each side. If I had the dough I would enclose the floating dock with a fabric like car tents they sell. The dock does rattle and roll slightly so it is probably not feasible. Thanks!
chopbuster	posted 08-05-2008 07:28 PM ET (US) I watched an old-timer use an artist's small brush to paint the black mildew stain with diluted bleach and rinse with water; the stain disappeared.
Whalerdog	posted 08-05-2008 08:29 PM ET (US) Tried to scrub it again and did try commercial bleach left on over night to no avail. Got a tad lighter but it still bugs me.
jimh	posted 08-05-2008 09:05 PM ET (US) [Moved to the POST-CLASSIC discussion.]
Sal A	posted 08-06-2008 05:16 AM ET (US) Try using Amazing Roll - off. Let it sit for ten minutes. Then work it. It will work.
poker13	posted 08-08-2008 03:02 PM ET (US) If bleach didn't kill it, it can't be algae, mold or mildew. Household bleach, like Clorox, will make that stuff disappear in minutes. I wonder what it might be.
Whalerdog	posted 08-08-2008 06:54 PM ET (US) it is some type of mold that penetrated they silicone
swist	posted 08-09-2008 12:53 PM ET (US) I've seen this on boat caulk, mainly silicone, the mold/mildew is actually forming inside the cured sealant. So putting bleach (or any other cleaner) on it doesn't do a thing. When this happened to me on my pre-Whaler boat, it was mainly at the joints of all the pieces that made up the cockpit on a cuddy-cabin ProLine. I had to scrape out the old stuff and recaulk it. I suppose you could also caulk over the old stuff, but that wouldn't be as neat as the beads would be too big.
Whalerdog	posted 08-11-2008 03:34 PM ET (US) I caulked over it today. It is recessed quite far and it still looks neat. See if it comes back. I may spray it every day with 3M mold remover. 3M also make a mold preventive spray.