23 replies to this topic

[jwb_moto]

Me and my dad have been trying to paint my new bonnet and wings this weekend but the paint seems to be drying very texturised to the point where the paint nearly feels like wet and dry.

Were using black celly based paint mixed with thinners at approx ratio of 50:50 at 50psi through a machine mart spray gun.

we were painting outside and it was fairly warm today (20 deg C in the sunlight)

has the paint gone like this because it was hot?

what ratio of paint:thinners do people nrmally use for the first guide coat of the top colour? and subsequent (SP?) coats?

cheers in advance.

[Pauly]

With celly it can be too hot to spray, you want a warm not a hot day and dont spray in direct sunlight or the cold. You want roughly 50/50 to put a good few thick coats then the secret is (dont tell anyone ) to mix it p*** thin something like 30/70 paint/thinners, so its like water and a bit thinner . This is a 'wet' coat and gives you the nice finish, will still need cutting back with some g3 probably aswell, dont get trigger happy with the gun when putting the wet coat on it will run very easily if you do.

Paul.

Heres a pic of mine straight from the gun.



And after cutting back and polish .

[jwb_moto]

cheers matey, im not 100% sure if the spray gun is much cop, so im going to buy another one tomorrow and try again after ive rubbed it all back again.

We were in the direct sunlight so would i be right in assuming that th thinners is evapourating before its hitting the panel?

i have a gazeebo would i be better spraying under this so theres a bit of shade?

[Pauly]

Mines a clarke gun HVLP gravity fed.

In direct sunlight the paint will dry to quick and the thinners will evaporate leaving the finish worse, a good gun (not a £10/£15 jobby) will give you a good finish when setup, its the mixture of the paint/thinners thats the secret, together with a good gun you wont go wrong.

Paul.

Edited by Pauly, 24 May 2009 - 09:11 PM.

[jwb_moto]

something like this?

HVLP gun

[Pauly]

Yep thats the one.

[roofless]

your pressure may be a bit high - maybe its vaporising as it leaves the gun so its not wet enough when its hits the steel.

Edited by roofless, 24 May 2009 - 09:44 PM.

[jwb_moto]

Martin, what sort of pressure should i be running it at? 35-40 psi?

[Pauly]

I spray at 40/45 PSI remember its HVLP (High Volume Low Pressure) I would say 50 was a bit much, spraying in the sun wouldn't help aswell, but celly does dry dull when used 50/50 thats why you need a 'wet' coat.

If you do a net search (google) you will find some good guides about spraying celly, its like an art .

Paul.

[Frog]

Me and my dad have been trying to paint my new bonnet and wings this weekend but the paint seems to be drying very texturised to the point where the paint nearly feels like wet and dry.

Were using black celly based paint mixed with thinners at approx ratio of 50:50 at 50psi through a machine mart spray gun.

we were painting outside and it was fairly warm today (20 deg C in the sunlight)

has the paint gone like this because it was hot?

what ratio of paint:thinners do people nrmally use for the first guide coat of the top colour? and subsequent (SP?) coats?

cheers in advance.

I used a standard "cheapy" machine mart gun for years they are a great gun to start with, Spraying like anything is down to practice. The texture you are getting could be down to the flow being to slow or pressure to high. I normally would thin celly 50-50 with thinners. Try slowing down you arm movements & let the paint flow on rather than trying to rush it. Some people will move to quickly across a panel due to fear of runs this causes an over spray effect rather than a smooth finish.

[GreaseMonkey]

Is your compressor up to using a Hvlp gun?

Linky

I've been told to use the above instead as the hvlp guns are for bigger compressors?

[Pauly]

I have a 3hp compressor with a 100ltr tank, and it just the job .

[jwb_moto]

i think the compressor is part of the problem as its only a 2hp motor

My dads mate who used to be a sprayer is going to give me some training as it was a little bit of the blind leading the blind.

So will report back on friday

[roofless]

Martin, what sort of pressure should i be running it at? 35-40 psi?

I use a SATA 3000 HVLP gun and thats happiest at 25 - 28 psi or thereabouts, any higher than that I seem to get the results as described. it fails to keep a wet edge to the paint so it goes very banded and a rough texturised finish.
I was showed to use a bit more thinners, less pressure and a broader fan and its all been pretty good since

this bonnet was awful untill i tried again with the above advice from my good buddy Sylvester. He used a GTi pro at similar pressures for a long while now and his results were superb.

[andysmini1]

Very interesting thread this.

I have just purchased of a chap at work a never used 50L 2hp 7cfm Compressor for £80 so this is what i'll be using. I can't afford a £200 gun so what are my options.

Would the Clarke AP16GF Gravity Fed Spray Gun be up to the job even though it is a 7.5cfm gun or would i be better off with one of the Clarke Pro 12C [1.2mm nozle / 6cfm] or Pro 14c [1.4mm nozle / 7cfm] guns?

Edited by andysmini1, 26 May 2009 - 02:27 PM.