"Crazed" pattern through the paint

[Paulo]

Hi All

Hope you can give me some advice on a problem with the paint/preparation which the previous owner had completed back in 1989 (know this because of a sheet of newspaper in the door!).

 

Started rubbing back what appears to be a two pack. A crazing has occurred on the bonnet/roof and across the horizontal planes of the body work. It is quite deep in places and the spray putty feels like it was shovelled on, it's so thick in parts! It covers a light spray of black paint which I guess is the primer /etcher and is finished in red. The original colour (Daytona Red #905, details from the sticker) is in good condition and I want to restore it to that colour.

 

I have been advised by the local paint shop to repeat the etch/spray putty and colour process, but don't want a repeat of the crazing effect.

 

Any advice as to what may have caused the original problem, how to avoid it happening again?

 

Would it be better to use an alternative to two pack?

 

Your help would be gratefully received!

 

Thanks

 

Paul

 

 

[Sirpent]

Post up some pics so we can get a better idea.

[Paulo]

Hi John,

 

Unfortunately my camera is as "period" as the zed, haven't worked out how to put the reel into the H drive (lol), it was quite deep, but didn't penetrate to the original Daytona Red.

 

It was suggested that I go acrylic by Salty (thanks for responding so quickly), but there may be a problem with this option as the paint shop sold me a 2 pac etch primer, which raises the question "do I use this product with acrylic?".

 

Thanks again for any help.

 

Paul

[Sirpent]

Do you have a camera on your phone?

 

Salty, how is he havnt seen him here in a long time !

 

Is what you are referring to look like crows feet as per this pic?

 

Cheers

 

John

[Paulo]

Hi John,

 

Camera on phone? This is technology way past my time travel!

 

The crows feet photo isn't what mine looks like. Imagine a satelite photo of a flooded river flowing to a delta, lots of inter laced streams which go no where and start somewhere, but combine to form an image of organisted chaos.

 

Salty thought it may be an overexuberance of spray putty, it is thick, and appears where it was easiest to apply.

 

Your thoughts on 2 pac etch being covered with acrylic, Salty was advocating acrylic.

 

By using acrylic, do I need or is it desirable, to have a HVLP gun?

 

Thanks and my apologies for lack of imaging

[Sirpent]

OK,

 

From what you described without actually seeing it it sounds like VERY poor surface prep before the material was laid down.

 

To use an analogy as far as surface prep, imagine freshly painted or polished paint work and then pouring water on it, the water beads and then accumulates, as you put it then streams.

 

Now imagine very dull oxidised paintwork which hasn't been polished for years, water sprayed on it in the same manner develops a film more or less evenly across the surface.

 

Unless a surface is properly prepped, the same effects will occur, whats happened in your case is that the sprayed material has failed to bond to the surface, as the solvents evaporate leaving only the material they contract and a grazing as you put it effect occurs, these are actually fractures in the non binding area's.

 

The only way to remedy this if I am correct is to take back all the sprayed material and start again.

 

As far as 2K etch primer, this is only used on bare metal, I cant see why it would have been used in this case so I'm unsure what you and Salty are referring to.

 

Any 2K product properly cured shouldn't present a problem if you are using acrylic products over the top as long as high concentrations of solvents aren't immediately applied resulting in destabilisation and solvent burn.

 

I found this EXTREME pic on the web, is this more in line with what you are referring to?

 

Cheers

 

John

 

 

 

[gilltech]

My advice is to 100% sand off all that crazing; get rid of it all; not what you want to hear I know. Do not try & paint over it or fill it, as mentioned in posts above it has already failed structurally & cannot be in any way suitable as a substrate for more paint. Start with a clean sheet.

[Paulo]

Thanks guy's

 

John, your extreme photo is exactly what it looks like, so I'm happy to start with the "cleansheet" approach recommended.

 

Really appreciate your input.

 

Cheers

 

Paul