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  #1  
Old 06-29-2015, 04:19 PM
lake weir skier lake weir skier is offline
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Boat: 1994 MasterCraft ProStar 190, 350 TBI, 1:1
Location: North Central Florida
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How should I approach this vinyl stain/discoloration?

I bought this 1994 PS 190 two years ago. This stain-discoloration on the motor box vinyl was not there when I bought the boat, but I don't know when it appeared or what it is. I discovered it after the boat was covered outdoors for several months. Perhaps it is mold or grease. You can still see the relief in the vinyl. It almost looks like it's in the vinyl instead of on it. It's approximately an inch across. It's on top of the motor box, so it's highly visible.

Products tried so far, none of which has changed it, are:

Starbrite SeaSafe Boat Wash
Dawn
303 Fabric/Vinyl Cleaner
Mixture of 2 tablespoons ammonia/ 2 ounces hydrogen peroxide/ 6 ounces water
Starbrite Mildew Stain Remover
3M Marine Mildew Stain Remover

What is it and what should I do?

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  #2  
Old 06-29-2015, 04:24 PM
Cloaked Cloaked is offline
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Almost looks like mold growing from the bottom, outward (?? Hard to say ??). There is a thread here about that issue.

One thing on your list I did not see is Totally Awesome Cleaner - Dollar Store. Some here swear by it.
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  #3  
Old 06-29-2015, 09:50 PM
atihanyi atihanyi is offline
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Boat: mastercraft prostar 190 1992 w/powerslot
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All Else Fails Try A Magic Eraser
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  #4  
Old 06-29-2015, 09:57 PM
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blackhawk blackhawk is offline
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Try TAC first, then non-gritty GoJo. If these don't work try the heavy duty magic eraser.
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  #5  
Old 06-29-2015, 10:01 PM
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osmonet osmonet is offline
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What color is your cover? Some people in warm climates get discoloration from dark covers in areas that touch the vinyl.

Quote:
Originally Posted by lake weir skier View Post
I bought this 1994 PS 190 two years ago. This stain-discoloration on the motor box vinyl was not there when I bought the boat, but I don't know when it appeared or what it is. I discovered it after the boat was covered outdoors for several months. Perhaps it is mold or grease. You can still see the relief in the vinyl. It almost looks like it's in the vinyl instead of on it. It's approximately an inch across. It's on top of the motor box, so it's highly visible.

Products tried so far, none of which has changed it, are:

Starbrite SeaSafe Boat Wash
Dawn
303 Fabric/Vinyl Cleaner
Mixture of 2 tablespoons ammonia/ 2 ounces hydrogen peroxide/ 6 ounces water
Starbrite Mildew Stain Remover
3M Marine Mildew Stain Remover

What is it and what should I do?

Attachment 129909
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  #6  
Old 06-29-2015, 10:10 PM
lake weir skier lake weir skier is offline
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Join Date: Aug 2013
Boat: 1994 MasterCraft ProStar 190, 350 TBI, 1:1
Location: North Central Florida
Posts: 196
Quote:
Originally Posted by lake weir skier View Post
I bought this 1994 PS 190 two years ago. This stain-discoloration on the motor box vinyl was not there when I bought the boat, but I don't know when it appeared or what it is. I discovered it after the boat was covered outdoors for several months. Perhaps it is mold or grease. You can still see the relief in the vinyl. It almost looks like it's in the vinyl instead of on it. It's approximately an inch across. It's on top of the motor box, so it's highly visible.

Products tried so far, none of which has changed it, are:

Starbrite SeaSafe Boat Wash
Dawn
303 Fabric/Vinyl Cleaner
Mixture of 2 tablespoons ammonia/ 2 ounces hydrogen peroxide/ 6 ounces water
Starbrite Mildew Stain Remover
3M Marine Mildew Stain Remover

What is it and what should I do?

Attachment 129909
Nor did my list include Magic Eraser. TA and Magic Eraser are two mentioned on TeamTalk relative to stain removal I've never used on the boat or anywhere else. Maybe I need to try them, but if the problem is underneath I guess they also will fail.

I'm having trouble finding that thread about mold growing underneath. If anyone knows where it is, I would appreciate guidance. Do you recall how the mold underneath was addressed? Did pulling up the vinyl and cleaning the back of the vinyl remove the discoloration or did the vinyl have to be replaced?
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  #7  
Old 06-29-2015, 10:27 PM
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neil.anderson63 neil.anderson63 is offline
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Before you do anything to it, try leaving it out in the sun.
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  #8  
Old 06-29-2015, 10:42 PM
lake weir skier lake weir skier is offline
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Quote:
Originally Posted by osmonet View Post
What color is your cover? Some people in warm climates get discoloration from dark covers in areas that touch the vinyl.
Medium gray. I'm in inland North Central Florida. It gets hot and humid here.
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  #9  
Old 06-29-2015, 10:50 PM
lake weir skier lake weir skier is offline
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Boat: 1994 MasterCraft ProStar 190, 350 TBI, 1:1
Location: North Central Florida
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Quote:
Originally Posted by neil.anderson63 View Post
Before you do anything to it, try leaving it out in the sun.
The photo was taken today. It was in the sun several days in the past week. Didn't seem to affect it.
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  #10  
Old 06-30-2015, 04:23 AM
Tsumi Tsumi is offline
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Quote:
Originally Posted by lake weir skier View Post
The photo was taken today. It was in the sun several days in the past week. Didn't seem to affect it.
If it's under the bimini then the sun can't do anything to it. It needs direct sunlight (specifically the UV rays) to kill mold roots.
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