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[Colin H]

Spot on Stavros,

As I have said before I know very little about spray painting but I know more than most about gas and the possibilities of explosions.

If a rattle can uses butane as a propellant the danger could be considerable. When the atmosphere within the room reaches its `lower explosive limit` using any electrical device i.e. switching on or off could result in an explosion of considerable force. Death or serious injury is the usual result I know I went to a few whilst with the gas board emergency service some years ago.

Colin H.

[Bee]

My reason for spraying outside is the insidious way the spray heads for the nearest white surface - sials, hull, paper etc. It isn't noticeable at first but then when you find a bit that was masked by something on it the difference becomes obvious. Very annoying.

[Wiggy]

Hi all,

A long time since I dealt with explosive contents of gases but if I remember rightly anything below 18% mixture with air was reasonably safe but the danger area was between 18% and 25% and believe me, that causes one hell of a bang!! Remember the old trick of filling a treacle tin with coal gas with a hole in the tin top and lighting it? As the gas volume burnt down it suddenly went off like a bomb and a friend blew his dads shed apart doing it with a 5 litre paint tin, the lid was 30 yards away. In an enclosed space spray paint and propellants do exactly the same thing without you realising it and turning the light on or even a fluorescent cause sparks, the fireball created is no respecter of skin, it just peels off !!
Like Stavros, I hope non of the Forum members ever find out the hard way.

Paul.

[boatmadman]

I have seen a demo of a gas explosion - 1 cubic metre under atmospheric pressure was released into a shipping container that had an open end covered with polythene to keep the gas in.

We, the audience, were standing about 200m away to the side of the container, the gas was ignited, the blast and noise made us step backwards - and we were expecting it!

So, never underestimate the power of explosive gases or the ease with which they can be ignited.

Ian

[Colin Bishop]

So, never underestimate the power of explosive gases or the ease with which they can be ignited.

So, does that mean we should lay off the curry then? 

[Stavros]

Colin DEFINATLY

Philipsparker YES most defiantly any thinner whether it be humbrol ,cellulose acrylic,meths,parafin,turps,petrol,white spirit.2k thinners etc etc etc are all inflammable and highly dangerous in the wrong conditions

Big H thanks for your kind comments,and yes I was being diplomatic for a change



Stavros(mellowing in his old age)

[Seaspray]

So far it looks like a good spraying day coming up. Get everything ready. Cover over workmate, model masked, spray can @ room temp and shaken up ready to go. I'll do it about 11 o,clock. Let it settle for 10 mins then back into the house. while shes  at work he he

I asked this question on an earlier reply. Is there a good paint that gives a finish near to it looking like it had been sprayed answers appreciated.

Seaspray

[Philipsparker]

I asked this question on an earlier reply. Is there a good paint that gives a finish near to it looking like it had been sprayed answers appreciated.

I assume you mean brush painted as opposed to spray (the answer to the question you just asked would be, "Yes, spray paint !"  ). I'd recomend Humbrol Enamel as the best brushing paint out there. The matt black is superb and I often brush it when I can't be bothered to spray. The trick is to use a good quality, clean brush and thin the paint very slightly. Apply and then leave it to dry, most brush marks are left by going over the paint when it is slightly dry. Use matt paint as the faster drying time stops bits landing in it. Several thin coats, rubbed down between then with very fine emery are better than one thick coat.

The downside it that the process takes a lot longer for big blocks of colour and you will struggle to get results as good as a spray for those. Little bits are OK though.

Finally, the best solution is to weather the boat after you paint it. That hides a multitude of sins !

Phil

[Philipsparker]

Oh, and here is a handy article for painters: http://www.doubleogauge.com/journal/enamelpaint.htm

Phil

[Seaspray]

Cheers Phil
Some interesting reading there.

Seems to refer to squires catalogue a few times. I'll have a look through it.
 
I had a friend that tried the wire in the drill chuck to mix paint and yes it was all over the place. Fortunately I had just open the door of his workshed 2 seconds after it happen ,won't ever forget his face and the workshed.

Seaspray

[Seaspray]

Didn't manage to do the spraying today, but done the sanding sealer parts. 

You won't believe this but I did say it was going to be a good day so much so my next door neighbour  (he is 80+) is cutting his grass. 

Seaspray

[malcolmfrary]

Regarding aerosols, propellant and enclosed spaces - a friend, (who is a member and might confirm this), read the instructions on a can of expanding filler which said "Keep in a cool place" and thought "We are having a hot summer, I will put this can in the fridge in the garage thus it will be kept cool".  A few months later there was a heck of a bang and the fridge door was blown across the garage.  The best guess was that propellant had leaked, formed a viable explosive mixture, and been ignited by the thermostat.