The Spray Painting Thread

[turbocaldina]

pm your address and mobile and i will ring when im leavin

cheers des

["Z" UTE]

The orange peel in the picture, indicates that the air pressure was too high, and your mix was low on thinners, you have dry sprayed. You have not put down wet coats. Going back through this thread you have had bags of overspray, again pointing to high air pressure. The paint is effectively drying before it hits the panel. You should also slow down the rate of gun travel, the coats need to be a bees dick away from running, this allows the paint to flow out and settle before all the thinners evaporate, reducing your orange peel, and promoting the gloss level. You have gone this far, so block it back with 320 dry and then 800 wet and give it another coat of clear.

Also 4 coats of acrylic clear is way too much for a beginner, that is part of the reason why the peel has built so bad. Thinning for clearcoat should be way more than 50-50. To get a wet clearcoat takes practice, in application and in thinning. The mix should stream off the mixing paddle. The mixed clear should almost be the same viscosity as water, just a tad thicker. I would suggest a mix of 30-35%clear and 65-70% thinners, for the first and second coats, followed by a 10%clear 90% thinners mix as the final coat. This final coat is applied a fair bit quicker, so as to avoid runs, but it still has to look wet when sprayed. This coat melds all the overspray and paint together giving you a high gloss finish.

cheers Chuck.

[da_foles]

We did ratio 2:3 2 being clear. Then final coat did 10% clear 90% thinners. I'm pretty sure we had to much air pressure and not enough paint. Could the colour also be orange peel? I take it that doesn't Matter because the clear will sort it out.

By using 320 dry and 800 wet are you saying to just knock back the clear back to paint?

Will wait for turbo caldina to have a look then go from there. Thinks we got some sanding ahead of us. Bah.

Cheers.

["Z" UTE]

Just knock the whole panel back till it is flat, you will hopefully not break through to the colour.

Practice makes perfect!

cheers Chuck.

[Z2TT]

Hi Chuck.

For the blending in with thinners, do I have to sand the final clearcoat flat and what not and then spray the thinners on the edges to blend them in.

Or can the spraying thinners on the edges to blend it in be done after my final coat of clear has just flashed off (as in not waiting 5 days to sand it and then spray thinners to blend it in).

Which method is best and why?

THanks.

["Z" UTE]

Z2TT, you spray the thinners as soon as the last coat of clear has flashed off. Remove all your masking to ensure you have no lines left at the edges of your repair.

Spraying the thinners when the paint has cured will achieve nothing.

cheers Chuck.

[da_foles]

This orange peels is coming out pretty easy with 1500 wet then 2000. I take it if I see colour in yhe water residue after sanding then I have hit through to the paint. How much clear would I be taking off when I buff the car. The guys at paint shops said u put 4 coats of clear down ten buff off 2.5 coats?

["Z" UTE]

Yes, you are correct, if your water changes colour, you have rubbed through. Buffing will remove a very small amount of clear, depending on the pressure you use. The amount of buffing required will depend on how flat you get the clear with sanding. As I mentioned before, just try to take the mountain peaks down level with the valley floor, With what you have to work with I would say you would be removing up to 50-75% of the clear you put on!

When colour sanding, you should always have a squeegee handy, to push the water off the area you are sanding. You need it dry so that you can see how flat you have managed to sand it. A piece of flexible rubber will work as well. Look at the area from a couple of angles, and you should be able to guage how well you are doing. You are looking for a very flat no gloss appearance with little to no orange peel. A final rub back with 3000 will make the surface really flat and smooth. A light buff with compound will bring the shine back really quickly.

Mate we all have to start somewhere, and way back when I started to paint I ended up with a surface similar to what you have got, (felt like 240 grit paper) took a while to learn how to paint properly, and I am still learning every time I pick up a gun, or a new paint.

cheers Chuck.

[Z2TT]

Thanks chuck, so 2 light coats should do it with thinners, want to avoid making the thinner run as I don't want it to eat into my existing paint and give runmarks :S

Well today tried to get some white onto the pillar, but the retarded can began dripping, and dripped all over my pillar. Paint went on ok, little bit dusty so going to have to knock it back anyway as it dripped, I guess I need to use a block so I can get those drips off without digging up the rest of the paint too much. Ahhh damn, now need to wait another 5 days for the paint to cure until i can sand Looks like I'll have to begin learning how to use my gun from now on, $12.50 per can sorta turns out to be more expensive than just getting it in tins.

What grit should I use for knocking back the paint, 400?

["Z" UTE]

The canned paint is so full of propellant and thinners, that the actual paint applied to the surface is 3/5 of 5/8 of %#@ all, so no need to wait 5 days before sanding that.

400 grit will be fine, then 800. then paint again.

Spray just enough thinners to wet the area, without runs, too dry, nothing happens. It will really only work on the sanded and newly finished paint. The thinners should not have any effect on the original paint.

cheers Chuck.

[Z2TT]

Oh, the can says though wait 5 days before sanding, I hope i'm somehow not weakening this film of paint by sanding it too early, which will result in chipping later on or something?

["Z" UTE]

If you are worried about the drying time,before sanding, you can always paint a test piece, and try sanding that at hourly/daily intervals to determine how long the paint takes to dry/cure.

The manufacturer will always err on the side of caution, taking the worst case scenarion where someone has layered up lots of coats fairly rapidly.

cheers Chuck.

[da_foles]

Does it matter if the colour was put on with orange peel? I don't think it does because the clear would fill all the bumps? I might have a second option to respraying it with clear if that falls through, then I will block all the orange peel off and we will have another go with the paint. We are thinking of putting another coat of black down, some of the bog work we did have a few pin holes in it so I want to go back and fix this. Would it be fine to just spray the black over the new primer over the new bog, building up those patches then running around giving the car another coat of black, then hit it with clear again.

So the car will have
Original paint, original clear, 4 new coats of black that has been sprayed on with to much pressure not enough paint and 4 coats of clear the same then one more coat of black then 2-4 more coats of clear? Is this fine?

Cheers

Andrew

["Z" UTE]

Andrew, to fix your pin holes, you could try dropping paint into them ie. dip a needle into some unthinned paint or clear, and let the paint/clear just drip off the nedle into the holes. Might be more practical to hi fill if you have bucket load of holes.

If you end up with primer, you just knock that back with 800, using a guide coat to make sure you have the repair spot on. Recolour that area, and extend 150mm past the repair with the new black, then go ahead with the recoat of the entire job with clear. Before putting the new clear on, the underlying paintwork should be as flat as possible, so I would recommend a complete going over with 320 then 800 wet to get the surface spot on for clear, or paint as the case may be, depending on whether you rub through.

Since you are retaining the same colour, stone chips etc will no show through as badly as a different batch of colours would. 12-15 layers of paint/clear does sound a lot doesn't it. Is this your daily, or is it destined for trackwaork, or other duties?, answering these questions will tell you whether 15 layers of paint is too much.

cheers Chuck.

[da_foles]

Cheers Chuck,

The car will be a daily. Is it cool if we rub it back with 320 dry then 800 wet prime the hifill and also two tiny dints we missed lol. then patch those with black but then give the car another coat of black all over. Then do the clear?

It won't be 15 coats of paint because alot of the clear we put down the other day will be sanded off.