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Old 16 September 2016, 06:35   #1
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Country: Ireland
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Brown stains

These brown stains have appeared on my Yam 360s
Are they evidence of the plastic deteriorating ( the dreaded Zodiac melting ) due to UV damage or just stains.I have tried scrubbing with washing up liquid and a scouring pad but no effect.
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Old 16 September 2016, 07:17   #2
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UV degradation + plasticizer migration.

Boat appears to be Chinese origin, possibly Mehler or Mirasol PVC with a hand glued seam construction.

Start saving your pennies for a replacement.
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Old 16 September 2016, 11:50   #3
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There are much worse places for brown stains to appear.
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Old 16 September 2016, 17:06   #4
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How old is the boat?
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Old 16 September 2016, 18:11   #5
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Bought second hand so not sure. The floors are ply so I guess it is quite old.
One site says not to worry about plasticizer migration, that the glued seams will come apart long before low quality PVC fabric will fail.
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Old 16 September 2016, 18:48   #6
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Depending how much you want to invest in this boat but you could paint the tubes with Tuff-Coat or Polymarine flexithane.

You'll find overtime when you try to wash the boat every time that more and more of the brown stains will appear from degradation. You'll also get the coating coming off and sticking to your shorts overtime you sit that area.

In this situation, painting could be a good option and will probably make the boat look much better than without.
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Old 17 September 2016, 02:26   #7
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Its the start of the issue, but at the moment it is probably just cosmetic. There was a thread here last year where I recall someone had good results using peroxide in a gel format (as per hair 'bleach') and bright sunshine to oxidise it away. It will come back though - but not sure how its lasted long term. I think a search for peroxide and yellow should find it you the thread.

Search was harder than I expected - but here it is: before and after with my Walker bay - assistance with final stain removal
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Old 18 September 2016, 02:20   #8
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Not to worried about cosmetics but how long before it becomes a safety issue and is there anything I can do to prolong the life of the fabric ?
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