Il pop up some pictures later if I get time but I'm after some advice as to how I got it wrong. I painted my bonnet last summer, first time using a gun an compressor. Using 1k paint. I keyed the original paint to the primer then applied a layer of primer from a can, then the colour then two coats of clear. After some wet sanding I was really happy. Few minor things like a fly and I over sanded one corner. First few weeks were great. Then winter came. The paint was suddenly ruined. The car lives under a cover. The two defects are tiny blisters, I believe these are called micro blisters and are caused by water in paint? This is only in one area. The second defect which is throughout the panel is cracking. The paint looks like it's shrunk and split apart. I assume this is some sort of reaction?

So before I try again, what went wrong?

Could it be because you used an aerosol for part of it. I thought they didn't mix well cos of something or other in the cans

Could it be because you used an aerosol for part of it. I thought they didn't mix well cos of something or other in the cans

 

If that's the case that would make sense.

 

 

Did you have a water filter just before the gun when spraying?

Yes a small water catch thing on the output from the compressor. Maybe not large enough. I know the compressor is under sized.

Cellulose is where you went wrong. It has all the strength of a runny turd. It weathers really easily especially on surfaces that get pretty hot and then cool. It will always shrink a little and will never retain the shine even after waxing.

 

Cellulose is 'ok' as a short term fix on smaller items, but not on anything of size.

 

The white marks could be a number of things from water under the surface to a reaction to something else. Did you use panel wipe and paint it inside on a dry day?

Trouble is I don't have anywhere I can safely use 2k. There's live stock in my back garden.

I was concerned maybe I was supposed to apply a fixative layer or something to prevent the new and old paint reacting?

There are sealer paints you can apply, but that won't help your cellulose stand up to weathering and it won't prevent other issues should you get moisture in the paintwork.

 

If you haven't got access, why don't you just bite the bullet and take your bonnet to a body shop. Prep it yourself and take in.

The blisters look like water between the base coat and clear coat......

In the winter the water between the 2 coats freezes causing blisters..... I found this out when I used a breathable expensive cover on mine and had blisters from under the base (colour) coat.......

mine feels like it has measles.......

Found this if it helps.....

http://www.baconsdozen.co.uk/Paintwork.htm

Russ

I can get a bonnet painted round my way for around £150-200.

 

I know we all like to do things ourself and save cash whilst havng fun, but sometimes it's not worth it.

 

Rather than all the hassle and guessing, just pay and get it sorted mate?

I can get a bonnet painted round my way for around £150-200.

 

I know we all like to do things ourself and save cash whilst havng fun, but sometimes it's not worth it.

 

Rather than all the hassle and guessing, just pay and get it sorted mate?

 

In honesty it's not saved me much by doing it myself as apposed to if got id had it done. By the time you factor in all the bits. Tbh though it wasn't a cost saving excersise it was a learning curve. Once I have the facility I plan to paint the whole car, if I can't get a flat panel right, well, it's a good place to start learning. Little stuff I can do, but bigger sections with a compressor is something I'm keen to learn.

The blisters look like water between the base coat and clear coat......

In the winter the water between the 2 coats freezes causing blisters..... I found this out when I used a breathable expensive cover on mine and had blisters from under the base (colour) coat.......

mine feels like it has measles.......

Found this if it helps.....

http://www.baconsdozen.co.uk/Paintwork.htm

Russ

From that it appears I applied to top coat too thick and there was moisture in it.

i've used 1k base and clear once on my zed on the rear spoiler after a year it cracked and crazed, it has no uv protection so the sun will kill it. i would never use it again, when i redid my spoiler 2 years ago i used 2k base coat and 2k lacquer (the type in the rattle can where you press a button to release the activator) it still looks as good today as when i first sprayed it.

As everyone has said its because it's 1k paint. It wouldn't be cellulose nowadays, it'd be acrylic based. What you've got to remember about a 1k paint is that it's the paint, dissolved in a solvent. Thats why wiping it with a rag socked in its thinner would take it off. It also never fully dries - it skins over.

 

A 2k paint not its component parts when cured. It becomes something else, think of a 2k lacquer when cured as a layer of epoxy instead. The thinner will hardly affect it.

I just painted my whole car in cellulose, and I haven't seen anything like this. I think I'm going to agree that moisture is getting though the filter, or the surface wasn't clean.

Fair enough mate, we do like to learn new stuff :)

I just painted my whole car in cellulose, and I haven't seen anything like this. I think I'm going to agree that moisture is getting though the filter, or the surface wasn't clean.

 

Neither did I initially. Other parts such as my spoiler and nose panel are good after a period of years. This happened quite quickly after initially looking great.

This is what it looked like in September;

By November it looked as it does know.

 

 

 

I'm not sure if this helps -

 

http://www.hotrod.com/how-to/paint-body/1309-how-to-correct-most-common-painting-mistakes/

 

The thing is, from what you're saying it isn't immediate thing, it happens months later, which is just plain odd.

Edited May 7, 20169 yr by MasterCookieman

Seems like I applied a heavier than desirable coat of clear. Il have to knock it back, see how far it goes. Then I'm going to try again.

Seems like I applied a heavier than desirable coat of clear. Il have to knock it back, see how far it goes. Then I'm going to try again.

 

I had what looked like a cracking effect on my tailgate, but only showed after polishing with G3. I don't think it is cracking, but deep score marks from something that got onto the polishing mop...only way I can explain it, or when rubbing down with 2500/3000 grit. Either way it ruined the finish and I'm painting it again tomorrow, weather permitting.

 

There is something therapeutic about spray painting though...or it's just me.

I actually think I have the same, or very similar problem now -

 

 

 

It was the same on the tailgate, which I've repainted. It's not happening on my left wing, and roof.

 

These have been painted for a good couple of months. The only thing I can think it that the temperature has recently increased...other than that, all remains the same.

 

Either way, it means I'm going to have to repaint. Gahh!

Oh that sucks! Really sad to see that mate. Sounds like you've had exactly the same thing happen.

Oh that sucks! Really sad to see that mate. Sounds like you've had exactly the same thing happen.

 

Yeah, I just hope that's the end of it!

 

It's the oddest thing, I mean they're deep ridges / scores, and seem to be in the clear coat. All I can think is that it got hot and expanded, and cracked.