Overpainting black bitumen paint?

[Lobster]

While fixing up the workshop, I've painted the bottom 18" of the back
internal wall with Aquaseal black bitumen paint in an effort to prevent
damp coming through (the construction is slightly complicated to explain
- the bottom of it is a concrete pad which is next door's [somewhat
higher] ground level, so it's a bit susceptible to damp).

Anyways, next up will be to paint the rest of the walls and floor, and
I'd quite like to overpaint the bitumen area at the same time, just for
cosmetic reasons. I emailed the mfr for recommendations on what to use,
and was advised: "our bitumen paint range cannot be over painted with
any paints that I am aware of as they bleed oils when heated up. The
only way to find out would be by contacting a paint manufacturer as they
may have something that we at Everbuild are unaware of".

So, any suggestions?! Do we reckon stain-block paint would do the
trick, or is bitumen paint too much for it to handle? I don't want to
waste my time overpainting it if it's going to bleed through anyway; it
would look worse than just leaving it... it's only a workshop after all!

Thanks
David

[Bob Minchin]

I've not found anything to stop bleeding when overpainting.
In my workshop I have hung polythene sheet*, polystyrene insulation &
timber battens and then clad in plywood. I then painted the plywood
That works!

Bob

*bitumen attacks polystyrene as well.

[Nightjar]

There used to be a paint for this job, but it is decades since I used
it, so who made it and what it was called are long gone. There are
solar reflective paints for flat roofs, but I doubt they are cheap and
probably only come in very large containers. The standard of finish
might also be a bit lower for a roof and I don�t know if they can be
overpainted. I do recall that the paint I used was heavily loaded with
aluminium, which may also be true of the solar reflective paints, so, if
you can�t find it from a specialist paint manufacturer, an aluminium
primer paint might work. If all else fails, or it does bleed through,
you could always make a feature of painting the bottom of the whole wall
black.

Colin Bignell

[mark]

"Lobster" <davidlobs...@hotmail.com> wrote in message
news:TnyQp.14799$yn7....@newsfe20.ams2...

Try water based masonry paint. I once had an end terrace which had black
bitumen paint over the entire gable end. Went to the experts... in person to
paint shops, manufacturers by email, etc. All seemed clueless. Tried the
masonry paint and it was fine. Anything with a hint of solvent is bad news
in this situation.

mark

[NT]

The issue isnt staining, its failure to adhere. Bitumen is famous for
nothing much sticking. You can torch things onto it though - perhaps
you could even iron lining paper on, I dont know.

NT

[Mark]

Aluminium roof paint from toolstation
http://www.toolstation.com/shop/Roofing+Drainage/Roof+Compound+Waterseals/d250/sd2809

or code 99690 if url wraps..

-

[harry]

On Jul 5, 7:43 am, Lobster <davidlobsterpot...@hotmail.com> wrote:

Paint the bitumous over with PVA glue 2X. This seals it in for
overpainting.
The cheap stuff for mixing with plaster/cement is OK.
You need to leave the bitumous as long as possible first, three or
four weeks ideally

[polygonum]

You are bound not to want to pay for this option, I don't know how much it
costs but it is bound to be very expensive. But it does list tarmac as a
substrate - which is quite close to bitumen.

http://www.johnstonestrade.com/product-range/product.aspx?product=Two_Pack_Adhesion_Promoting_Primer

Rod

[kow...@gmail.com]

you could use ormonoid silversheild as it is made for overpainting ormonoid bitumen paint.

[harry]

Primer coat of PVA first.
However, if there is positive water pressure the bitumen will flake off anyway.
So not a good solution.
Google "tanking" for proper solutions to problem.
You local builders merchants probably have some products.

[sat_...@hotmail.com]

David, Did you find a answer that worked as I have the same problem. Chris

[alan_m]

On 04/12/2015 11:54, sat_...@hotmail.com wrote:
> David, Did you find a answer that worked as I have the same problem. Chris
>

Aluminium Primer?
http://www.duluxtradepaintexpert.co.uk/web/pdf/datasheets/204.pdf

http://tinyurl.com/pkae5rx

20+ years ago when I renovated my house most of the paint work had an
undercoat very much like tar. It appeared to be rather sticky even when
left for many weeks. A lot of hard work got it most of it off and a
coat or two of aluminium primer has stopped any bleed coming through
white painted surfaces.

--
mailto: news {at} admac {dot] myzen {dot} co {dot} uk

[fellrunn...@gmail.com]

I used black bitumen, on a wall, then an oil based gloss paint, followed by a water based masonry paint. No black has come through. The idea was to change paint types from bitumen, to oil then finally to water based.

If left to dry long enough bitumen paint is fine to paint over. Like all old paint, it is best to wash of surface grease and salts.

Ray

[soup]

On 14/08/2016 18:32, fellrunn...@gmail.com wrote:
> I used black bitumen, on a wall, then an oil based gloss paint, followed by a water based masonry paint.
> No black has come through.
> The idea was to change paint types from bitumen, to oil then finally
to water based.

Take it he has painted it a few times since, as the OP was over five
years ago.

[harry]

On Tuesday, 5 July 2011 07:43:14 UTC+1, Lobster wrote:

I gave some bitumous paint several coats of PVA and then painted it.
Was OK for ten years at least.
If there was positive water pressure behind it, you might get flaking off.

[Brian Gaff]

2011 eh.
Funny how these threads come back to life.

Brian

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[Harvey]

replying to Lobster, Harvey wrote:
Hi I'm painter and decorator from the uk we use to paint over bitumen with.
Aluminium primer sealer 1st then we carried on as normal .

--
for full context, visit https://www.homeownershub.com/uk-diy/overpainting-black-bitumen-paint-715593-.htm

[Anthony D]

replying to Harvey, Anthony D wrote:
Aluminium primer is a wonder paint. It stops metal from rusting, seals against
water ingress and can be used instead of bitumen paint in many situations. It
can also act as a wood preservative by trapping the oils in the wood and
preventing it drying out. ( make sure wood is not wet with water first though)

[ayesha]

replying to Lobster, ayesha wrote:
to the best of my limited knowledge, you need to overcoat it with a bituminous
aluminium paint; followed by 2 or 3 coats waterbased paint in your choice of
color

[joseph...@gmail.com]

So I’ve made a mistake and painted an internal wall with black bitumen paint and then put a layer of emulsion which has started to flake off.

Would I be alright to put a layer of PVA and then paint over it again?

Many thanks

[Bob Minchin]

I don't think you stand a chance.

[The Natural Philosopher]

I tend to agree.

Probably best to line it with lining paper. Test that paste holds to it


--
"It is an established fact to 97% confidence limits that left wing
conspirators see right wing conspiracies everywhere"

[Chris Green]

Our solution of many years ago was a coat of alumninium paint over the
black bitumen.

--
Chris Green
·

[tabb...@gmail.com]

I once used bitumen paint to line a mould, thinking the stuff wouldn't stick to it. But it very much did. It was a cement mix.


NT

[tyroneb...@gmail.com]

On Tuesday, July 5, 2011 at 4:43:14 PM UTC+10, Lobster wrote:

Ty,

A lot of the comments are irrelevant. There are two types of bitumen paint: oil based and water based. Oil based bitumen paint is difficult to get today.

Make it clear in you comments what type you are talking about. They are two entirely different paints.

[tabb...@gmail.com]

Most of mine is paraffin & bitumen. You can always make that if you buy bitumen. I'm told you can get 25l drums of bit from builder's suppliers (not diy sheds).


NT