mould in fibreglass - Fiberglass RV


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Old 01-07-2013, 01:35 PM   #1
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Name: Deigh
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mould in fibreglass

hi, I'm a new member from New Zealand. I have a 6metre Mazda bus which I converted to a motorhome some 12 years ago. My wife and I live in it permanently. After winter it is just like a house in as much as it has to have a thorough spring clean. This year we have had an unusual problem. There are small areas of black mould in the fibreglass interior especially in corners where it is difficult to get to. Trying to clean it off with bleach type cleaners only works temporarily and then a few weeks later it returns.

Has anyone got a permanent answer for this problem?
Deigh Davies
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Old 01-07-2013, 01:47 PM   #2
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Welcome to our group! I know that I have some mildew or black mold problems at times, too, and bleach does clean it off. However, the mold returns because there are two conditions present: moisture and a somewhat porous surface. I haven't solved my problem yet, but it would seem that you need something to fill the little holes that the mold likes to grab onto, thus sealing the area. Perhaps a good heavy wax or sealant for fiberglass, preferably with a mildew retardant? Hopefully someone else will chip in, too.
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Old 01-07-2013, 02:11 PM   #3
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Welcome Deigh from slightly up from down under. I think your bus needs air circulation (vents open), dehumidification (reusable dessicant or refigerator-type dehumidifier) or a mold killer. I saw one mentioned recently in a thread on buying used trailers with this problem but can't remember the name. Something similar must be available in NZ.

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Old 01-07-2013, 06:24 PM   #4
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+1 on getting it dry and keeping it dry. You might try running a dehumidifier in it for a while after cleaning with something designed to kill/prevent mold.

One mistake people often make with those type of cleaning products is to not leave them on long enough. Most need to sit for a period of time before removal.
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Old 01-08-2013, 07:48 AM   #5
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For mould on fiberglass I would recommend a cleaner containing oxalic acid - the word acid sounds a bit harsh but, for example, it's the active ingredient in Bar Keepers Friend. Cleaners for boat hulls and decks are the best place to look for it.
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Old 01-08-2013, 02:03 PM   #6
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mould

Thanks, that is the sort of info I was looking for, will search the internet for the product. Ventilation is not a problem in spring and summer but in winter we use a de-humidifier to keep dampness down and rely on a big cleanup in spring to catch up on the sneaky stuff!
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Old 01-08-2013, 04:43 PM   #7
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[QUOTE=Andrew Gibbens;354563]For mould on fiberglass I would recommend a cleaner containing oxalic acid -

Searched the internet and can't find it in NZ. One source said it was marketed here under 'White Magic' and stocked by a local merchant. Have just been down and looked and it 'aint there! Searched the vast array of cleaners for one containing oxalic acid and there was nothing, it may be banned in this country. I did find a grout cleaner containing 'Sulfamic Acid' and have purchased that as a tryout. The warnings on the container are a bit scary!!

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Old 01-08-2013, 05:09 PM   #8
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Yikes!

I think Sulfamic acid is more for descaling of mineral deposits...

Mold is a living organism that only needs to be killed, and there's nothing that does so more effectively than plain ol' bleach. As noted above, it needs to sit for a time to effectively kill all spores, but in my experience it will regrow anyway if conditions are right.

You're getting regrowth simply due to moisture and enough re-accumulation of organics to support mold growth. It's always a bigger problem in winter due to higher indoor humidity levels, at least around here.

There are some compounds that can be added to paint that retard molds/mildews. If this is a huge problem for you it might be worthwhile looking into those.

Good luck!

Francesca
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Old 01-08-2013, 05:48 PM   #9
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Part way down the page is NZ distributor of Bar Keepers Friend. With phone and email address. oxalic acid cleanser and great stuff in general IMHO.

International Sales

You might also try paint and wood working stores, oxalic acid is wood bleach. I dip a small scrub brush in water, then in powder so brush has a paste on it then scrub away.

I also used a product called LA Awsome cleanser (available from Amazon shipping could be an issue) inside elephant hide of my camper was black in places, gray in others. I cleaned with these two products with scrub brush and no return.
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Old 01-09-2013, 07:22 AM   #10
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hi, I'm a new member from New Zealand. I have a 6metre Mazda bus which I converted to a motorhome some 12 years ago. My wife and I live in it permanently.
Sounds very cool; I would really like to see some pictures.
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Old 01-09-2013, 01:41 PM   #11
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You might want to use White Vinegar. Chlorine bleach will take several applications to kill the root. Vinegar will kill the root.

Will White Vinegar Kill Mold & Mildew? | eHow.com
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Old 01-09-2013, 03:17 PM   #12
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Sounds very cool; I would really like to see some pictures.
It's about time I added some interior shots of the bus. This one is outside obviously.
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Old 01-09-2013, 04:18 PM   #13
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Sounds very cool; I would really like to see some pictures.
Right, here is an attempt to add some!!

1 is me in gutted 'bus, expression tells it all "What the hell have I got into?"

2 ,3 and four, Click image for larger version

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ID:	54146Gradual improvement of insides with table designed to fold down into gap to make bed area.
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Old 01-09-2013, 04:24 PM   #14
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'bus

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Sounds very cool; I would really like to see some pictures.
More pix!!

Table folds down and opens up to make bed base. (Printed in wrong order!)

Bedroll containing thin foam mattress and duvet rolls down to cover area which makes bed 6ft x 6ft and easy to climb out of and into! It is very comfortable
Last pix is of boot which is now fishing area and contains 3 sets of waders,seven fishing rods and lots of other stuff, also heater to dry out waders!!
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