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Clear coat gone cloudy

Started by _Zeke_LJ_ , Jun 03 2008 01:02 PM

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27 replies to this topic

#1 _Zeke_LJ_

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Posted 03 June 2008 - 01:02 PM

I need help!
After spraying the car, there is a line on the roof and several on the bonnet where the clear coat has gone cloudy and I cannot get it out. I've just rubbed the whole car back with 1200 and buffed it but it did not get rid of these lines. Am I not sanding enough or using the wrong sandpaper? Any ideas?

I tried to get some good photos to show the lines, but its raining and theres not much light etc etc and you cant see the full extent of the lines but they are there!

I'd like to know how it happened and also how to get rid of it as it's really getting on my nerves!

Any ideas or suggestions would be great and much appreciated!

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#2 _Big T_

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Posted 03 June 2008 - 01:27 PM

When you sprayed the clear, what was the weather like? What time of day?

I had something like that happen when I sprayed clear and the responses from my post Clear coat gone milky suggested my problem was the time of day I sprayed and the humidity level at the time.

I am however no expert on the topic.

When I re-did my clear coat I got streaks like you have but this was different from my previous effort. It ended up being clear coat overspray and lucky all I had to do was let the clear flash off and then I wiped the panel with a tack cloth to remove the overspray. I had to do this after each coat of clear.

The end result turned out OK though.

The painting experts will be able to give a better diagnosis than me though.

Cheers,

T

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#3 _Herne_

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Posted 03 June 2008 - 01:31 PM

Cold weather would be one such cause. But as stated above this has recently been covered in depth

Its all in the archives.

Herne

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#4 _Yella SLuR_

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Posted 03 June 2008 - 06:19 PM

Mmm, beaded water on it tells bit of a story.

You need good weather to paint, that or a controlled environment (booth).

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#5 _Zeke_LJ_

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Posted 03 June 2008 - 06:35 PM

Yeah.... Honestly I've got no idea about paint but whenever I wash it it's like the water leaves a dirty sort of mark and streaks in it, even if I use a chamois to dry it... I know it's a sealant issue, but what exactly?

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#6 _Yella SLuR_

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Posted 03 June 2008 - 06:50 PM

Start with more sanding as a starting point, 1200 grit. Looks like a bit of overspray (painting too slow, with not enough paint coming out the nozzle, possibly air too high?). If that fails and you go through the paint, you can always start again, which is the alternative if it is due to moisture.

If it were moisture, I'd expect it to be clouded more evenly.

Do you paint using a water trap? A water trap mounted on the compressor is nearly as good as not using a water trap at all.

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#7 _Yella SLuR_

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Posted 03 June 2008 - 06:53 PM

How are you checking sanding progress? By using a flexible sanding pad (bit of foam with a hard and soft side) you can use it as a squigee to see how you are progressing. Ultimately, you don't want any shiny dots left before moving to cutting compounds. After cutting compounds you are after no scratches, then on with polish.

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#8 _Pete_

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Posted 03 June 2008 - 09:26 PM

My opinion is the paint has been applied too dry, I dont think you'll be able to rub and buff those Tiger Stripes out too successfully.

I'd suggest a good rub down with 800-1000 wet so the surface is flat, 2 coats of your Blue Basecoat, then reapplication of your Clear.

When you apply the clear next time, Open your fan setting some more, open the fluid nozzle some more, Use more Overlap than you did last time and lay it on really wet, Acrylic is really hard to get a run in particularly on a bonnet so don't be scared.

Most importantly I'd also suggest going for a better quality thinners too, theres a lot of dry spray there which means the paint is drying in the air before its hitting the panel. Some Retarder Thinners will help slow down the drying time for the paint also but use sparingly.

If your painting it again and experience this dryspray you can always give it a quick coat of straight thinners to try and melt it into the paint surface while the paint is still drying.

Another tip for bonnets/roofs, Start on one side of the panel and work your way across, particularly with Acrylic Lacquer if you start in the middle of the panel and work outwards and then come back in the middle when you do the other side you will get some dryspray there.

Don't get discouraged, no one is having a go at you, it's great to see a young bloke giving it a go, have another crack and it will work out fine!!

Posted Image

Cheers Pete

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#9 _gstar_

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Posted 03 June 2008 - 10:26 PM

Hi Zeke, looking much better! ill check if i have a front blinker for you

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#10 _Zeke_LJ_

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Posted 04 June 2008 - 09:38 AM

lol thanks greg i wanna go over it again with the 1200 and buff it im still not 100% happy but its nearly done... I cant do shit in this weather though you know what its like but as soon as I see some sun I'll be giving it another shot! thanks for the help btw

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#11 _wardy_

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Posted 04 June 2008 - 05:07 PM

Looks to me like the base coat has been sprayed on like a solid paint , did you use a criss cross pattern when doing the metallic base or spray it on like a solid colour. This will give it a milky look on top but you problem will be the base colour. There is only 1 way to fix this problem and that is to rub back with 1200 and relay your base evenly, just my opinion but

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#12 _gstar_

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Posted 04 June 2008 - 05:49 PM

what about rub it down & flow coat it with blueprint, or maybe a pearl?

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#13 enderwigginau

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Posted 04 June 2008 - 08:08 PM

Acrylic is really hard to get a run in

I beg to differ Pete. hehehe

But then I am a mere novice in these matters.
Take Pete's advice as it will most definitely steer you in the right direction.

Wardy,
It hasn't been said, but the base coat was fine prior to the clear being blown over.

Grant..

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#14 _Zeke_LJ_

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Posted 06 June 2008 - 08:13 AM

Thanks for the advice guys... I'll have to wait a while before I can get any more paint on it, all the paint and spray gun set up is at a friends place, and we dont have any shelter to spray it in so I've gotta wait for good weather... which is very rare where I live though lol thanks for the help!

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#15 _squirralien_

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Posted 05 July 2008 - 06:51 PM

You can also get that effect when you hold the gun at the wrong angle, you need to spray the bonnet and roof with the gun spraying at 90 deg, so the fan pattern is even, if its the wrong angle then you will most likely have the bottom edge of the fan pattern spraying to heavy in to the panel and the top edge providing you with what you think is a good coverage but the bottom edge is to heavy and causing this pattern, this is more likely to be the case than dry spray as the dry spray would usually be a wider area. I am unsure why the heavy edge will do this maybe from airating the clear coat where the heavy edge of your spray pattern is, similar to pouring water in to a bucket only then you will see larger bubbles being forced under the water.
Alot of learner painters will do this because it can be difficult to hold the gun over horizontally level.
Thats my theory and as I am well and truley over it, im sticking to it.
start at one side working in to the middle and then go to the other side of the car and start at the middle and work back towards yourself. with metallics after you have got the coverage that you want, it also helps to do even dust coats over the car from a bit further away to get all the metallic excited, it will look lovely and cover up areas where (if) you have the metallic uneven for any reason.
Make sure its not cold outside when you spray as the acrylic paints will go milky or cloudy from the cold, also larger areas than your stripes, this is with straight colours or clear coats.
Always make sure your gun is clean and spraying a nice pattern and make sure the breather hole in the lid is clear and not blocked, it also helps not to have a full gun doing boot bonnets and the roof, make sure if your lid moves that you set it with the breather hole closest to the handle of the gun so when your spraying the bonnet the breather is up at the top of the lid to prevent dripping from the hole.

Keep practicing and enjoy it because you will get there and get so much self satisfaction for what you have done

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#16 _LXEFI-8_

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Posted 08 July 2008 - 10:28 PM

i am a spray painter by trade so i might be able to shed some light on the situation if it was painted in acrylic then it couuld be in the base coat but it looks like it is in the clearcoat the cause is either to thick of a pass on the clearcoat (usually happen when you go for the flat glass look) or the day when you painted it was to cold causin the clear to bleamish
if it was painted in 2 pak then it looks like it will be in the basecoat where you have had dry spray usually on to hot of a day

just post up what type of paint you used and what type of day it was and i will figure out cause and rectification for you

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#17 _Zeke_LJ_

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Posted 09 July 2008 - 09:09 PM

It was just a normal acrylic paint and it was sooo long ago I sprayed I cant really rememberr but I think it may have been towards the end of a hot day...

Edited by Zeke_LJ, 09 July 2008 - 09:10 PM.

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#18 _Zeke_LJ_

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Posted 09 July 2008 - 09:10 PM

...

Edited by Zeke_LJ, 09 July 2008 - 09:11 PM.

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#19 TerrA LX

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Posted 09 July 2008 - 09:21 PM

did it get cold soon after?

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#20 _Zeke_LJ_

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Posted 09 July 2008 - 10:14 PM

It was so long ago but I dont really think so... Not too cold anyway.. just general temperature drop when the sun starts going down

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#21 TerrA LX

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Posted 09 July 2008 - 10:46 PM

Datill do it

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#22 _LXEFI-8_

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Posted 11 July 2008 - 09:41 PM

DONT BELIEVE IT WAS TEMPERATURE DROP OR ITWOULD BE MORE CLOUDY AND THERE WOULD BE MORE OF IT NOT JUST STREAKS NORMALLY PAINT BLEMISHES CAUSE IT IS TOO COLD BUT USUALLY IF IT IS JUST A LITTLE BIT COLD THEN YOU CAN BUFF IT OUT I WILL GO BACKAND INVESTIGATE YOUR PICS A BIT MORE

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#23 _LXEFI-8_

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Posted 11 July 2008 - 10:34 PM

will read over my old tradie books on the weekend and see what they say

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#24 _gstar_

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Posted 12 July 2008 - 12:00 AM

Ill return that buffer in a couple of weeks gstar

yeah cool zeke, i have some buffing to do in august

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#25 _Zeke_LJ_

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Posted 12 July 2008 - 07:27 PM

I've been meaning to message you I lost all my numbers (again) though.
I did the whole car once over and some bits came up good just like that section you did but some bits are still crappy and Ive been waiting for a chance to redo them but I've just started working
I can bring it back whenever you want though let me know!