The Spray Painting Thread

["Z" UTE]

How long do I wait for last coat of colour to dry before I put on the first cost of clear

20 minutes or so, just look for the gloss level/wetness look to subside a bit.

Realisticaly by the time you have finished the colour coat, cleaned out your gun, mixed the clear and had a cuppa, you are ready to go full steam ahead with the clear.

cheers Chuck.

[da_foles]

Chuck your a legend. One more question. We have primed her and sanded bak with 800 wet. Have cleaned the paint residue off from primer. However while cleaning with a rag we have noticed a distinct feel between existing paint that has no been primed and areas that have been primed. Should the primer be rough still after 800 wet? Paintng tomorrow morning

also is it fine to just run thinners through the gun to clean out betwen colour and clear. I got a display gun from the shop and the box is missing the spanner that comes with it.

[Z2TT]

My C Pillar has not been rust treated on the spots, the rust treatment seemed to have filled the spots in a bit. Then covered the C Pillar in Etch primer the whole part not just the metal bits.

Now next step is going to be to use the filler to fill in the small small crevices along the edge, and then after that sand the etch primer with 800 wet I assume this is fine to use for sanding primer. Then after i got it all level go over the Pillar with Hi fill, then sand the hifill to get an even surface with 800.

Colour coat about 5 coats, extend a bit beyond the C Pillar yes?, then Clearcoat and extend again a little bit more.

Then I'll be taking out the spray gun, it's a Devilbiss Gun. To spray some thinners in to melt it into the original paint. Just wondering, to give it a shot of thinners on the edges, how much pressure should I feed to the gun?

And I'm keen to know also how to clean guns after using say Yellow, then want to use White, or then want to use something else. Just clean the container out with thinners and spray thinners through the gun until you get no paint coming out?

["Z" UTE]

da_foles, yep that "feel" is correct, as the original unsanded paint should have a silky feel when you drag your knuckles over it. When you have applied the colour and the clear, you will still notice a difference, but that is reduced or eliminated by wet sanding the clear caot with 2000, 3000, then compounding and buffing.

If you do not have the spanner, a dodgy cleaning method, is to flush the gun with thinners, empty it out, add some clean thinners,then holding a cloth over all the orifices ijn the nozzle pull the trigger with air connected, it will blow the crap out of the nozzle and back into the pot. You must cover and uncover all of the holes in a random sequence, this flushes the paint out of the airways.

I strip clean my guns after every spray job, in your case you are spraying black then clear over black, I see no problem with a little black tint in the first layer of the clear. but just grab a couple of spanners from the tool box to pull the gun apart to clean it up before you store it. Any paint left in the gun will solidify and block passages.

cheers Chuck.

["Z" UTE]

My C Pillar has not been rust treated on the spots, the rust treatment seemed to have filled the spots in a bit. Then covered the C Pillar in Etch primer the whole part not just the metal bits.

Now next step is going to be to use the filler to fill in the small small crevices along the edge, and then after that sand the etch primer with 320 wet I assume this is fine to use for sanding primer. Then after i got it all level go over the Pillar with Hi fill, then sand the hifill to get an even surface with 320 then 800. Be there for ever just using 800.

Colour coat about 5 coats, extend a bit beyond the C Pillar yes?, then Clearcoat and extend again a little bit more.

Then I'll be taking out the spray gun, it's a Devilbiss Gun. To spray some thinners in to melt it into the original paint. Just wondering, to give it a shot of thinners on the edges, how much pressure should I feed to the gun? 45-50psi on a nine metre hose.

And I'm keen to know also how to clean guns after using say Yellow, then want to use White, or then want to use something else. Just clean the container out with thinners and spray thinners through the gun until you get no paint coming out?

That will consume quite a lot of thinners

Just edted and high lighted in bold and blue,


cheers Chuck.

[DrNick]

Hah I just noticed something purely by accident.

Lately, I sometimes get orange peel in my finished work, and it takes quite a bit to cut it back. I never really sussed out why it happened about half the time.

Only a few days ago I happened to spray a rear hatch and a bumper at the same time. So same conditions, same primer, same paint (PPG), same gun (devilbiss).
I just had a look and the bumper is absolutely perfect and looks so good I could even leave it like that with no buffing.
The rear hatch has lots of orange peel and will need cutting back.

As I said, these were painted at the same time, with the same materials in the same conditions.
What do you gurus say?
(I have only one idea that i came up with but I will keep it to myself for the moment so i dont bias your thinking )

[da_foles]

So wet sand the final coat of clear? The paint shop never mentioned this they jet said cut and buff 2.5 coats of clear off leaving 1.5 coats also how long to let dry after final coat of clear before cutting and buffing? 24hrs?

[da_foles]

Help help. We are spraying the clear and we are getting alot of overspray dust, is it ok to wipe the car down with wax and grease remover between coats? Also getting some white milky dots that are just popping up on the car for no reason? What can we do?

["Z" UTE]

da_foles, You may only need to buff the paint and not sand it, but most home spray jobs get little bits of crap in the paintwork, and invariably a lot of orange peel. To get a factory look, most if not all of the orange peel needs to be sanded down.

Leave the car alone for a few days, park it in the midday sun for a couple of days, the UV helps to cure the paint. Wet rub too soon and the paint will ball up and scratch the crap outa your new paint job.

Soak your 2000 in a bucket of warm water with a capfull of sugar soap added, soak for at least 20 minutes before you use it. Fill a spray bottle with the same water sugar soap mix. Spray an area about half asquare foot with the soapy water, and start sanding, Dry off and check every now and then, you are looking for a very flat dull surface with no high or low spots.Move on to the next section and repeat. Repeat the entire procedure with 3000 if you can get it, or just go to the next step.

When the entire newly painted area is done, machine buff with a good cutting compound "JUICE" is good, steer away from the Kitten stuff as most contain wax, and you do not want wax at this stage. After buffing wash off the residue with soapy water, rinse and chamois dry. Now apply a coat of colour sealer and glaze, hand buff of when dry. Apply a coat of wax, and hand buff off, stand back and have a beer you have earned it, and so has the old man, you owe him big time.

DrNick, you are painting two materials which have different heat retention characteristics, metal versus plastic.


cheers Chuck.

[da_foles]

these milky dots are strange though not all over the car maybe like 4 dots in a bunch of different sizes?

is it ok to wipe the overspray dust off the car? between coats?

["Z" UTE]

Help help. We are spraying the clear and we are getting alot of overspray dust, is it ok to wipe the car down with wax and grease remover between coats? Also getting some white milky dots that are just popping up on the car for no reason? What can we do?

Do not worry about the overspray, your final coat of 90% thinners 10% clear will fix all that. The white spots could possibly be water from the compressor, open the drain cock at the compressor base and let the air push the water out. Drain the water from your regulator as well.

cheers Chuck.

[da_foles]

how can we get the waterspots off the car? thanks again chuck

[da_foles]

those spots come off when we wipe the dust off with out finger? Are you sure it is ok to not worry about the dust? there is shitloads of it all over the car. The clear just hangs around in the make shift booth we have.
is it ok to wipe with wax and grease remover between coats or will this stuff the clear?

[turbocaldina]

dont wipe anything in between coats of clear as they are still wet and the clear will be sticky, if you using 2 pak that is

["Z" UTE]

You should not be touching anything at the moment. maybe dust the car off with an air gun. Rags at this stage are a no no., Keep spraying the clear.

cheers Chuck.