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Water stain on Spa n Deck

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  1. #1
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    Default Water stain on Spa n Deck

    Hi All,
    Iíve just stripped back our deck and used SpA n Deck to re coat it, 3 coats all up.
    My wife has placed 2 pots on the deck and when Iíve moved them they have left those big black water stains.
    Iíve never had this happen with Spa N Deck before.
    Have I done something wrong with application?
    Attached Thumbnails Attached Thumbnails 6d597dc5-6063-438c-ae4a-076ecab0ff1a.jpeg  

  2. #2
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    Can you say what the pots are made of metal, clay etc and how long they have been sitting there after the coating was completed ?

  3. #3
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    I think they are fibreglass and they were put there a week after coating and left there for nearly 2 weeks.

  4. #4
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    Wishing I could offer a reason but I really can't. I have been using Spa&Deck professionally for 13 years & over 300 decks sanded & coated with Spa&Deck. All I can say is there must be some type of reaction between the pot material& the coating. Sorry for such a woeful response but I really have no idea. Metal sitting in direct contact with uncoated timber once wet will leave black marks. As your pots are not metal it is a mystery. Maybe someone smarter than me can help. I know you don;t want to hear this but you may need to sand off these effected boards, recoat and put the pots on feet to prevent this from occurring again.

  5. #5
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    Could it be something in the potting mix leaching out? But if it's your normal pots and normal gardening methods... Mystery

  6. #6
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    I just did a deck rejuve for a mate and he had 2 pots sitting on his jarrah deck for a year. The coatings had completely dissapeared all over, but more problematic was the timber under the pots which had rotted under the pots, and only under the pots. I just karchered the rotten timber and scrubbed it until i was back to something decent. Then coated it and it looks fine.
    So it is possible that the timber needs sun and air or it will just rot.

  7. #7
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    Quote Originally Posted by rebuildr86 View Post
    ...
    So it is possible that the timber needs sun and air or it will just rot.
    Timber needs sun?!? Ye gads!!! There are one or two on here who would have you committed for such nonsense!!

    Me, I agree with you 100%

  8. #8
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    Well look im not a timber expert, but i did do a woodcare course with orica many moons ago, and i remember something about rot being the biggest problem and thats why we have treated pine.
    Maybe i should say its probably more about the fresh air than the sun keeping the timber dry.

  9. #9
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    Well, if it's a deck, and it gets lots of sun, it's probably getting fresh air.

    Some others here would suggest the sun does a deck more harm than water.

  10. #10
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    The part under the pot plant isnt getting fresh air.... That was my point

  11. #11
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    Perhaps just get slightly bigger pots , put some feet under them to minimize contact with the deck. You have now covered up the stains & can enjoy the deck.

  12. #12
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    Quote Originally Posted by rebuildr86 View Post
    The part under the pot plant isnt getting fresh air.... That was my point
    And it's staying wet as a result. Any way it can dry out will help. Water is evil

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