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CNKS or other Paint Guy

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scotty

09-12-2006 07:21:13

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CNKS, I know you have done alot of painting so I thought you might have some answers on this subject. As you can see from the pic, I just painted the fuel tank and battery box. I know some of you guys use some pretty exotic paints along with hardeners etc. This is your basic enamel paint job, I used IH Red and thinned it slightly and applied it with my Porter Cable HVLP gun.

I thought I was very careful about preperation etc. My eyesight is still good even at 55 but when I get within about a foot of the finished surface, in a few places I can see very faint fisheyes on the surface. I wipped the entire surface with paint thinner before I started. Wondering what would cause those slight imperfections ? Is there anythingt else I can do to prevent that ? Overall Im quite satisified, considering I dont have alot of experience doing this type of thing, just trying to get your feelings. Thanks.

scotty

Fuel Tank

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Harlen Larson

09-12-2006 16:16:43

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Re: CNKS or other Paint Guy in reply to scotty, 09-12-2006 07:21:13

Water is a big factor with fish eyes even with an hvlp. If you don't have a drier in the line the round disposable dessicant filters work pretty well. Also they might not be fisheye they could be solvent pop. This is often mistaken for fisheye but they are not as deep. This is caused by driving the paint on to thick or not waiting long enough between coats for solvent to escape. In both cases the solvent gets trapped and with nowhere to go pops out the top. The only way to fix it would be to sand and recoat, but most small things you see inside are not noticeable outside. Good Luck

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CNKS

09-12-2006 09:28:51

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Re: CNKS or other Paint Guy in reply to scotty, 09-12-2006 07:21:13

I have not read the other posts, so this response is not influenced and is not contradicting the others. Fish eyes are caused by oil, silicone or finger prints. You can use fish eye remover in the paint but the best thing to to is to use wax and grease remover, not paint thinner, immediately before painting, and don't touch the surface afterwards. Use a good tack rag before painting, not a cheap Walmart one. A perfect finish is impossible to attain -- I cannot get all the dirt or lint out of my paint regardless of what I do. Also, I sometimes get slight depressions that I don't call fisheyes, as a true fisheye will be very obvious and go almost to the primer. Mine aren't very noticeable, and don't occur all the time, I have not solved that one yet. You either have to accept some imperfections or color sand and buff, which you cannot do unless you use hardener.

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scotty

09-12-2006 09:40:58

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Re: CNKS or other Paint Guy in reply to CNKS, 09-12-2006 09:28:51

CNKS, Thanks for the reply.I guess I dont have fisheyes after all. Just some slight imperfections. After reading all the suggestions I do have some good ideas to try! I still have the hood and the front grill assembly to paint yet. Thanks !

scotty

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CNKS

09-12-2006 09:47:39

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Re: CNKS or other Paint Guy in reply to scotty, 09-12-2006 09:40:58

If your ideas work, let us know what they are -- I have no clue what mine are.

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BillyinStoughton

09-12-2006 09:01:52

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Re: CNKS or other Paint Guy in reply to scotty, 09-12-2006 07:21:13

I've always wiped things down with tack cloth (fresh out of the wrapper) and then use Prepsol like some of the other guys have said. I've always had great results doing it this way. It would be worth a try.

Billy

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Andy Martin

09-12-2006 07:37:36

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Re: CNKS or other Paint Guy in reply to scotty, 09-12-2006 07:21:13

Fisheyes are from foreign objects, most often droplets of water. Of course that should not be an issue with HVLP. My guess is that the surface was not really clean. Is this your first coat? Did the primer look good after it was on? Light sanding and recoating is in order.

Nice paint booth. Could it be dust particles on the paint?

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El Toro

09-12-2006 07:34:44

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Re: CNKS or other Paint Guy in reply to scotty, 09-12-2006 07:21:13

Fish eyes are usually cause by contamination from oil, water or silicone. If you wet sanded the surface could have caused this. You should've used prepsol in place of paint thinner to clean the surface prior to painting. Hal

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scotty

09-12-2006 07:42:36

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Re: CNKS or other Paint Guy in reply to El Toro, 09-12-2006 07:34:44

Thanks for the suggestions guys. I have never heard of Prepsol ! I dont think I got any water in the line because I have an inline filter but I quess its possible. This is my spray booth at work and we have had some water issues in the air lines in other parts of our shop.

Thanks again !

scotty

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CNKS

09-12-2006 09:35:53

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Re: CNKS or other Paint Guy in reply to scotty, 09-12-2006 07:42:36

I use PPG DX 330 -- $20+ per gallon but well worth it. It is also good for cleaning metal before sanding, etc. It will remove the oil that remains on the surface after pressure washing, etc. Wet sanding itself will not cause fish eyes, contaminated rags used during the process or your fingers can. I use the 330 over the primer, in that case it has all be wiped off, as it is strong enough to react with the primer, and can leave visible residue that can be seen in the topcoat.

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El Toro

09-12-2006 08:34:23

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Re: CNKS or other Paint Guy in reply to scotty, 09-12-2006 07:42:36

Any auto paint store that sells Dupont or PPG paint should have prepsol. Hal
PS: It has been out for many years.

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