Which Bedding Sealant ?

JohnM20
JohnM20 Forum Participant Posts: 1,416
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edited July 2019 in Caravans #1

I need to replace the Truma water inlet unit on to the side of my caravan. The Truma instructions say "use a non-hardening mastic, not silicone". Which one should I use?

I know Sikaflex 512 is supposed to be good but it's described as an 'adhesive sealant'. I've also looked at Seamseal CV which has the right sort of description. Any comments please?

Comments

  • lornalou1
    lornalou1 Forum Participant Posts: 2,169
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    edited July 2019 #2

    Phew, thought you were going to ask about wetting the bed. surprised

  • Merve
    Merve Forum Participant Posts: 2,333
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    edited July 2019 #3

    Sikaflex 512 is what I would go for. 

  • Tinwheeler
    Tinwheeler Forum Participant Posts: 23,146 ✭✭✭
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    edited July 2019 #4

    Sikaflex 512 is not a non-hardening mastic.

    Look for the words non-hardening/setting bedding mastic on the tube. Anything else will make future removal very difficult or impossible. The manufacturer knows the best type of sealant to use.

  • Vanbirds68
    Vanbirds68 Forum Participant Posts: 149
    edited July 2019 #5

    My thoughts didn’t go that far but I did wonder why anyone would want to seal their bed...

  • richardandros
    richardandros Club Member Posts: 2,684 ✭✭✭
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    edited July 2019 #6

    When I replaced the water inlet on our last Barcelona, the sealant was left behind - almost in the form of a gasket. It was still sticky, so I simply replaced the inlet on top of the existing sealant and achieved a perfect watertight seal.

  • Tinwheeler
    Tinwheeler Forum Participant Posts: 23,146 ✭✭✭
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    edited July 2019 #7

    Whereas if it had not been fitted with a non-hardening mastic, you’d have had a devil of a job. 

  • richardandros
    richardandros Club Member Posts: 2,684 ✭✭✭
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    edited July 2019 #8

    Quite!

    A yacht chandlers is probably as good a source as any for such mastics - since they are widely used in the boating industry.  I have a roll of something called "Flexistrip" which is a non-setting mastic in strip form - ideal for this job. It's been in the garage for years and still hasn't gone off.

  • Davannette
    Davannette Forum Participant Posts: 1
    edited August 2019 #9

    I can safely recommend 'No Nonsense All-Weather Sealant' from Screwfix, provided you get the mating surfaces clean. It's a polysulphide sealant, which adheres even to wet surfaces. It has better properties than silicone mastics, and will remain pliable for years; the bond is incredibly strong - it never fails. The Screwfix product code is 5074D. 

  • peedee
    peedee Club Member Posts: 9,389 ✭✭✭
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    edited August 2019 #10

    I would have thought any good dealer would supply you the right stuff. I don't have any dealers near me and I have just taken out a window and resealed it. I used IDL 99 Mastic Non Setting caravan sealant ordered on line from LeisureShop Direct

    If you go on U-Tube and search for jobs like that there are plenty of videos on what to use and do.

    peedee

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