Unusual Deck Stain

WoodBH

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My 2016 Bennington 21SX has developed a very strange, large stain on the stern deck forward of the motor and behind the rail. This portion of the boat is open to the weather. There is no rust dripping from above or anywhere on the boat. We’ve used cleaners, straight bleach, CLR plenty of elbow grease scrubbing it and even pressure washed it to no avail. It’s almost like it’s rusting from underneath? Bennington dealer/service is stumped. See photos below. Thoughts?
 

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Pbakk

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That is strange. I have used WD-40 on grease stains for carpet, but not sure how it would work on this type of flooring. If you use it, maybe try a very small test area first? Let us know how it progresses. Hopefully it is covered under warranty. Maybe the glue from the flooring is bleeding thru?
 

Alicedream

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You are not.the first one to have this issue. I have seen other posters on this site as well as others I go to. Talk with your dealer and see what they have to see but from the other posts I've seen on this issue it is probably a glue or flooring material problem.
 

BURRIS PROP

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I have a similar stain on my aft by the motor.
 

Link

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I had the same stain in the same place on my boat. Turns out it was from spilled gas. I only use ethanol free and since not available on the lake I carry it in 5 gallon containers. No matter what I did could not remove stain. Bugged me so much I eventually had the vinyl replaced. Have learned to be extra careful
 

Remediation

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Use a super siphon.
 

Rick from Rocky Mount

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You are not.the first one to have this issue. I have seen other posters on this site as well as others I go to. Talk with your dealer and see what they have to see but from the other posts I've seen on this issue it is probably a glue or flooring material problem.
Yes, there have definitely been other posts on this matter and I believe the floors were replaced under warranty. Check the other posts out.
 

Michiman

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My 2016 Bennington 21SX has developed a very strange, large stain on the stern deck forward of the motor and behind the rail. This portion of the boat is open to the weather. There is no rust dripping from above or anywhere on the boat. We’ve used cleaners, straight bleach, CLR plenty of elbow grease scrubbing it and even pressure washed it to no avail. It’s almost like it’s rusting from underneath? Bennington dealer/service is stumped. See photos below. Thoughts?
To be clear, it appears that you have carpeting rather than vinyl but I have similar staining on my vinyl. At first, I thought it was caused by a poor acid wash my dealer performed but over the past few years there have been a number of people that have posted with similar stains. Thankfully, my stains have faded since 2017 so they are not as noticeable because I haven't gotten anywhere with regard to a warranty claim.
 

Michiman

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This is what my stains look like:
IMG_1049.JPGIMG_1126.JPG
 

Pbakk

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Boy - that staining looks bad and frustrating, especially on the newer vinyl flooring. I wonder if UV light is impacting it. Is it covered when not in use?
 

Michiman

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Actually, the bow area is covered but not the stern. However, only the port side of the stern is affected so UV rays seem an unlikely culprit. As I previously indicated, I believe that the staining was the direct result of a poor acid wash, which the dealer is not disputing. However, I've seen some pictures from other owners that look like mine but had not been subjected to acid. Thankfully I have a 10 year warranty and the stains have mellowed in the past few seasons.
 

WoodBH

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My 2016 Bennington 21SX has developed a very strange, large stain on the stern deck forward of the motor and behind the rail. This portion of the boat is open to the weather. There is no rust dripping from above or anywhere on the boat. We’ve used cleaners, straight bleach, CLR plenty of elbow grease scrubbing it and even pressure washed it to no avail. It’s almost like it’s rusting from underneath? Bennington dealer/service is stumped. See photos below. Thoughts?
Just a note that the floor is vinyl, not carpet.
 
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