Mastic Sealing
+11
sidecutter
Chris_U
Pete F
sunidorset
fred1
Roymck
Eltel
gpilky
Roopert
Caraman
simontm1959
15 posters
The Auto-Sleeper Motorhome Owners Forum (ASOF) :: Auto-Sleeper Motorhome Forums :: Auto-Sleeper "Coachbuilt Motorhomes" Forum
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Mastic Sealing
I can't find any posts about this, but has anyone got a solution for mouldy mastic.
The Broadway is only 3 years old and it's really spoiling the look of the van - i've attached a picture of the affected roof mastic, but the side wall mastic is similarly affected.
Thanks
Simon
PS - Does anybody know where i can get cable ties with the sticky pad for the aerial cable - they've all come off!
The Broadway is only 3 years old and it's really spoiling the look of the van - i've attached a picture of the affected roof mastic, but the side wall mastic is similarly affected.
Thanks
Simon
PS - Does anybody know where i can get cable ties with the sticky pad for the aerial cable - they've all come off!
simontm1959- Member
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Posts : 29
Joined : 2019-03-20
Location : Northumberland
Auto-Sleeper Model : Broadway EB
Vehicle Year : 2019
Re: Mastic Sealing
Regular roof cleaning helps as does parking the van on a slope so rain water doesn't pool on the roof. I park mine with the rear nearside wheel on a levelling wedge which seems to do the trick. As for cleaning that horrible black stuff, I have found the best way is with a small quantity of neat thick bleach scrubbed on with an old toothbrush and then left for a while to do its stuff before rinsing with fresh water. It doesn't get it all off and it sometimes leaves a slightly pink hue behind but its an improvement. If you are going to do this, take care to keep the bleach away your clothes and skin.
Caraman- Member
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Posts : 3740
Joined : 2019-04-19
Location : SALISBURY
Auto-Sleeper Model : Nuevo
Vehicle Year : 2019
Re: Mastic Sealing
Regarding the cable tie bases - self adhesive bases are easy enough to buy, but I don't any more for exposed locations, because the standard ones are no good for paces that get hot in the sun.
If you still have the bases without the "sticky", clean up the underside and cut your own sticky pads out of 3M VHB double-sided tape or equivalent.
If you still have the bases without the "sticky", clean up the underside and cut your own sticky pads out of 3M VHB double-sided tape or equivalent.
Roopert- Member
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Posts : 3766
Joined : 2019-03-10
Location : South East
Auto-Sleeper Model : Trooper
Vehicle Year : 2005
Re: Mastic Sealing
Looks a bit like mine!!!
I used Slinky last year and it helped. Apply using an old toothbrush. Wasn't perfect though and I expect it might take a few goes.
This time I will try applying it with a polishing pad on my Dremel and see if it works better.
I used Slinky last year and it helped. Apply using an old toothbrush. Wasn't perfect though and I expect it might take a few goes.
This time I will try applying it with a polishing pad on my Dremel and see if it works better.
gpilky- Member
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Posts : 256
Joined : 2019-11-21
Location : Huddersfield
Auto-Sleeper Model : Broadway EB
Vehicle Year : 2017
Re: Mastic Sealing
I have the same problem with the seal between the top of the windscreen and motorhome body.
The dealer has told me there cure on vans for sale is to remove the old sealant and replace.
The previous post mention ‘Slinky’ not sure what that is ?
I do however have a Dremel drill though
Thanks
Terry
The dealer has told me there cure on vans for sale is to remove the old sealant and replace.
The previous post mention ‘Slinky’ not sure what that is ?
I do however have a Dremel drill though
Thanks
Terry
Eltel- Donator
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Posts : 898
Joined : 2017-01-10
Member Age : 74
Location : North Staffs
Auto-Sleeper Model : Nuevo EK
Vehicle Year : 2017
Re: Mastic Sealing
I've just looked up removing mould from silicon sealant on Google and the suggestions in order of potency appear to be ammonia, bleach or baking soda & vinegar paste. I've not tried the first and third methods but might in the future. It seems the secret is to kill the mould by penetrating its roots. I'm not sure that normal surface cleaners will do that.
Caraman- Member
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Posts : 3740
Joined : 2019-04-19
Location : SALISBURY
Auto-Sleeper Model : Nuevo
Vehicle Year : 2019
Re: Mastic Sealing
Many thanks Caraman
My only concern would be in using any of the above is that could it penetrate the seal and let in water.
Terry
My only concern would be in using any of the above is that could it penetrate the seal and let in water.
Terry
Eltel- Donator
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Posts : 898
Joined : 2017-01-10
Member Age : 74
Location : North Staffs
Auto-Sleeper Model : Nuevo EK
Vehicle Year : 2017
Re: Mastic Sealing
I've used the bleach method in the bathroom with no ill effect and so far no ill effect on the motorhome. If that is a concern I am pretty sure a vinegar baking soda paste would be fine.
Caraman- Member
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Posts : 3740
Joined : 2019-04-19
Location : SALISBURY
Auto-Sleeper Model : Nuevo
Vehicle Year : 2019
Re: Mastic Sealing
Soak some cotton wool in bleach and leave on the mouldy area for a few hours then neutralise with water , also works a treat at home on the grouting round the bath and in the shower .
Roymck- Member
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Posts : 186
Joined : 2020-06-03
Location : Dorking .Surrey
Auto-Sleeper Model : Gatcombe
Vehicle Year : 2004
Re: Mastic Sealing
Try fungicidal spay it kills and removes mould and mildew and prevents against regrowth.
fred1- Member
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Posts : 181
Joined : 2019-07-20
Location : Hythe Kent
Auto-Sleeper Model : Amethyst
Vehicle Year : 2005
Re: Mastic Sealing
Our "60" reg Broadway's sealant was pretty sad all round so I replaced most of the mastic with Sikaflex 512 - it should last a while. (My Dremel wasn't allowed out of the drawer!)
Has anyone used "Mould Magic" by " Must Have Ideas"?
This week's project with the downturn in the weather has been removing rust from the (steel) spare wheel with Jenolite and then priming and painting.
Has anyone used "Mould Magic" by " Must Have Ideas"?
This week's project with the downturn in the weather has been removing rust from the (steel) spare wheel with Jenolite and then priming and painting.
sunidorset- Member
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Posts : 57
Joined : 2017-12-13
Location : Dorset
Auto-Sleeper Model : Broadway
Vehicle Year : 2010
Re: Mastic Sealing
I use Elbow Grease, degreaser which comes in a spray bottle for around £1. Spray on neat, leave for a short while then scrub off and for this I use a Sonic Scrubber, (like an oversize electric toothbrush, last seen in Lakeland for about £15). It can get some dirt off but if the mastic itself is discoloured then I haven’t found anything that works and being a panel seal I am loathe to disturb it, particularly knowing that any replacement will do the same.
Pete F- Member
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Posts : 35
Joined : 2020-02-27
Location : Rutland
Auto-Sleeper Model : Kemerton xl
Vehicle Year : 2022
gpilky- Member
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Posts : 256
Joined : 2019-11-21
Location : Huddersfield
Auto-Sleeper Model : Broadway EB
Vehicle Year : 2017
Re: Mastic Sealing
Yes, try Cillit Bang Black Mould remover. It works well in my shower both on the grouting and the mastic sealer, but my motorhome has not needed it so far.simontm1959 wrote:I can't find any posts about this, but has anyone got a solution for mouldy mastic.
The Broadway is only 3 years old and it's really spoiling the look of the van - i've attached a picture of the affected roof mastic, but the side wall mastic is similarly affected.
Thanks
Simon
Chris_U- Member
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Posts : 13
Joined : 2021-05-11
Location : Fakenham, Norfolk
Auto-Sleeper Model : Talisman GX
Vehicle Year : 2000
Re: Mastic Sealing
Thanks for all the replies - I think I'll start with the Cillit Bang and if that doesn't work onto bleach!
simontm1959- Member
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Posts : 29
Joined : 2019-03-20
Location : Northumberland
Auto-Sleeper Model : Broadway EB
Vehicle Year : 2019
Re: Mastic Sealing
I wouldn't bother with Silky. All you'll get is sore arms and not a noticeable difference in bodywork appearance. Definitely doesn't remove mould.
I once watched a video comparing a Hymer motorhome to a Swift. Where the Swift had exposed sealant on all the seams the Hymer had aluminium strips with rubber seals. Definitely looked a far better method. Even the vertical exposed sealant seams get mouldy. It's just the design of most affordable motorhomes and being exposed to the elements. I've often wondered if a similar motorhome that was always located in a drier climate would develop mould.
I once watched a video comparing a Hymer motorhome to a Swift. Where the Swift had exposed sealant on all the seams the Hymer had aluminium strips with rubber seals. Definitely looked a far better method. Even the vertical exposed sealant seams get mouldy. It's just the design of most affordable motorhomes and being exposed to the elements. I've often wondered if a similar motorhome that was always located in a drier climate would develop mould.
Guest- Guest
Black mould
Hi, Simon we had the same problem with our Broadway EL we tried in vain to remove it, it was all around the cab area what removed it was Cillit bang black mould remover it took a few applications but it worked,hope this helps.
sidecutter- Member
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Posts : 37
Joined : 2016-02-01
Member Age : 69
Location : Burntwood, Staffs
Auto-Sleeper Model : broardway EL duo
Vehicle Year : 2014
Re: Mastic Sealing
Cillit has worked a treat - just as well as I didn't have my best cardie on though as it is quite brutal on clothes :)
simontm1959- Member
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Posts : 29
Joined : 2019-03-20
Location : Northumberland
Auto-Sleeper Model : Broadway EB
Vehicle Year : 2019
Re: Mastic Sealing
There is only one way to get perfection and that is remove the old silicone and replace with a quality product. I have tried all sorts of quack remedies on yachts and our motorhome and frankly none of then work.....but
SWMBO suggested trying cilit bang black mould remover, I was extremely sceptical but best keep her happy. Now the results are not perfect by a long shot but it is by far the best thing I have tried and gives a vast improvement. Spray it on, leave it for a bit then I wash it off with loads of water.
Worth a crack!
SWMBO suggested trying cilit bang black mould remover, I was extremely sceptical but best keep her happy. Now the results are not perfect by a long shot but it is by far the best thing I have tried and gives a vast improvement. Spray it on, leave it for a bit then I wash it off with loads of water.
Worth a crack!
groundhog- Donator
- Posts : 6105
Joined : 2011-08-01
Location : Poldarkland
Auto-Sleeper Model : Worcester
Re. Mastic sealing
All the mastic seams on our 11 plate Broadway EL look pretty grim, I am relucktant to remove & replace them as we have no water leaks at all @ pres. Sods law may prevail if I remove & replace them, I could wind up with a leak/leaks!!!
I am experimenting by cieaning the mouldy seams & painting them using a thin artist brush & gloss paint matching the body work, slowish job but looks good.
I am experimenting by cieaning the mouldy seams & painting them using a thin artist brush & gloss paint matching the body work, slowish job but looks good.
mrsolo- New Member
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Posts : 1
Joined : 2017-11-25
Location : Preston, Lancs
Auto-Sleeper Model : Broadway
Vehicle Year : 2011
Re: Mastic Sealing
I use Astonish Mould & Mildew remover, works a treat, available from Amazon
As simontm1959 says, it will wreck any clothing it gets on, ruined a brand new tee shirt this week using it
As simontm1959 says, it will wreck any clothing it gets on, ruined a brand new tee shirt this week using it
_________________
Cheers
Ralph
RalphHughes- Member
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Posts : 199
Joined : 2017-11-05
Location : Warrington
Auto-Sleeper Model : Nuevo EK
Vehicle Year : 2008
simontm1959- Member
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Posts : 29
Joined : 2019-03-20
Location : Northumberland
Auto-Sleeper Model : Broadway EB
Vehicle Year : 2019
Re: Mastic Sealing
Not singling out Autosleepers but pretty much all manufacturers use the cheapest products, if you compare what is used on quality yachts you will see the difference. Guess the trouble is everything is built to a price but if you can afford to spend £80K on a new van is there not an argument to say make it £85K and build it properly?
groundhog- Donator
- Posts : 6105
Joined : 2011-08-01
Location : Poldarkland
Auto-Sleeper Model : Worcester
Re: Mastic Sealing
Amazingly, the company who did the habitation check (on Monday) says 'think the seal might have split after the check' hahaha - I am not sure how to answer this!
simontm1959- Member
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Posts : 29
Joined : 2019-03-20
Location : Northumberland
Auto-Sleeper Model : Broadway EB
Vehicle Year : 2019
Re: Mastic Sealing
In the same way Russia is carrying out a "special operation"....
groundhog- Donator
- Posts : 6105
Joined : 2011-08-01
Location : Poldarkland
Auto-Sleeper Model : Worcester
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