Who knows? Nitro and synthetic paint.

I sent my Chevy to the painting. There was a problem, if not remove a layer of old paint, then paint the modern is not connected with the old paint. Primer paint peels and swells. Who knows what you can override the old nitro? Thank you.

 

I am not a paint guy, but there are some very knowledgable and talented painters here that can answer your question...but, it sounds like you need to strip all the old paint off before you can repaint.

Any of you guys know what he's talking about?

 

Yes, I'm sorry. Electronic translator may not correctly translate what I say.

 

I have heard information that there is an intermediate priming coat for the job

 

As I understand the question he is asking what product he should use over old nitrocellulose laquer to prime and seal. He seems to have a problem with the new paint lifting.
Since I have no idea what new paint he is useing, over there in Russia it could be any thing, I am afraid to make a reccomendation.
Some one smarter than me needs to chime in here.

 

Well I haven't done it myself, so research before you take my word. I have heard of cheap guys sanding the old paint to roughen it up, spraying a good etching primer over the lacquer, and then topcoating.

You need to keep in mind that there isn't going to be a good way to paint over that lacquer. Lacquer tends to crack with age, and if your stuck to the lacquer and it comes off the new paint will peel off as well. You really should take it down to metal if you want lasting results.

I'm not sure of your budget or what's available in russia, but if you can't afford a media blasting, maybe some aircraft stripper will work for you? I know it takes forever to sand it all off by hand, but this also may be the way to go if you want it done right.

 

Well I haven't done it myself, so research before you take my word. I have heard of cheap guys sanding the old paint to roughen it up, spraying a good etching primer over the lacquer, and then topcoating.

You need to keep in mind that there isn't going to be a good way to paint over that lacquer. Lacquer tends to crack with age, and if your stuck to the lacquer and it comes off the new paint will peel off as well. You really should take it down to metal if you want lasting results.

I'm not sure of your budget or what's available in russia, but if you can't afford a media blasting, maybe some aircraft stripper will work for you? I know it takes forever to sand it all off by hand, but this also may be the way to go if you want it done right.

 

Take a day or two and strip the thing down to bare metal.

 

Usually other paint will adhere to lacquer ok but lacquer will sometimes have reactions when put over enamel.

If the car was waxed with a silicone based wax it may cause a reaction. Also if anyone used a silicone based lubricating spray in the shop where the car has been sitting it may cause problems with fisheye or bubbling. The real painters will have to come out and say what they think you should do though.

 

There are Urethane based primers here in the states that make a good intermediate primer when changing paint types. They are neither enamel or laquer and most work well between the two, just dont sand through the primer back to original paint or you are in trouble all over again, the coating must be completely intact.


Scot

 

Rustem,
I think I understand what you are asking. You want to know if you can blow modern paint over old lacquer.


We used to shoot acrylic lacquer over nitro cellulose lacquer no problem and we also used to shoot acrylic enamel over both types of lacquer with no problems. It was a common belief that you could not go the other way lacquer over enamel. But that has also been done the enamel has to be real old and completely g***ed out or cured.

I do not think that you can shoot modern urethanes over old lacquer. From what I have heard when you do the solvents burn the older paint and cause it to lift, peel ans swell.

I do believe that there is a primer sealer that you can use to make the transition. Perhaps contact Dupont or PPG to find out what it is or maybe one of the fellas just knows.

 

Hey Rustem,

You could have several things going on with the failure of this paint job: A newer urethane finish was shot over old enamel top coat/undercoat. A sealer or undercoater was shot over the old finish and not mixed properly, allowed to dry properly, or too long a period after the sealer was sprayed before the top was sprayed. An etching type primer was shot over an old finish

To correct this without stripping the finish back to bare metal, or atleast the old paint job will require you find a sealer that will work with the old enamel or lacquer- the new urethane ones won't. You'll have to find out what type of new paint is being used, and find a sealer that will work under it.

" Life ain't no Disney movie "

 

What your looking for I think is an Enamel paint job ,Will work over any old laquer job,Newer paint will lift old laquer ,New laquer,Think Enamel ....I still do mine that way...

 

striping to bare metal would be best. but what you can to do is sand the lacquer and do any repairs needed, then seal with epoxy then put your s/s urathane over it . most base coats will lift old nitro lacquer

 

Thank you friends! I will look for a way out.

 

I had the same problem in the past. I used a water base sealer over the lacquer paint. Let it cure out good, then you can paint this new paint on top of it. I used ppg's globle water born sealer thats what the ppg guy's told me to use. Worked out grate for me. Its been about 5 years on the paint with no problems. hope it helps

 

Почему бы не удалить старую краску?

 

Martin Senour FS510 (black) FS512 (gray) FS514 (white) sealer will seal it so you can paint it with enamels or urethane's but not lacquer. You also need a FS614 reducer this stuff has never failed me to seal out all old surfaces.