Project equipement require and question following tutorial readding.

[superfly]

Hi all,

I have just re-read the paint tutorial section, I have read it about 4 times by now.
So I have made a list of the thing needed, and also on the step require, and I have few questions about it.

I also would like to share with you my project, as I have a lot at the moment I have about 5 project (It was only 4 this morning but I bought a another car which need respray this evening )

So let's start by the first one, the current project is a 924 which need a full respray, panel beating, engine rebuild so as the inside....

The engine should go to the engineering shop soon enough.
So I am left with some panel beating (I have a rough idea how to get myself sorted), and I will have a bit of spraying obviously.

I would like to start by painting the engine bay, for several reason:
1. It is more mistake friendly, I believe.
2. The engine is out so I might take the oppertunity.
3. I need to start by somewhere.
what do you think about my idea?

I have decided that I will spray with cellulose as it will more safe for me.

I have a couple of question if you can give me some answers it will be amazing.

1. The 924 is factory fully galvanised. If I use a paint stripper and strip disc to go back to the bare metal, could in anyway affect the galvanised protection?

2. In the engine bay, I have see a sticker saying that the car was factory paint with enamel, so I supposed if I want to respray it I need to either use a barier coat or remove the paint. What do you think?

3. In primer section of the tutorial, it is mention self etch primer and high build primer. It is also mention mist coast for the self etch primer.
I understood that the self etch primer goes first and then the high build primer but I have to said that I don't fully understand what is the mist coast and how it seat in primer.

Could you explain to me a bit more about that?

4. I suppose an anti stone-chip primer is a very good way to protect from rust as it is adding a sort of bitume protection on the metal?

5. Is the stone-chip primer could be apply with the spray gun or it is not recommended?

6. I am thinking about getting myself some air tool, like a orbital sander for example. I believe it will save me a lot of time.
Is wet and dry sandpaper are existing for orbital air sander?
Do you have any power tool to advice me on?


Thanks a million for you help and this forum/tutorial they are amazing.
Superfly

 

[Coo]

I'll give it a go answering !

Yes it's a good idea to paint engine bay with engine out

I would try to avoid baremetalling unless absolutely necessary...
,..using a flap wheel could remove the galvanised coating if used to heavily.

Not sure on compatability between enamel/celly
a mist coat is applied before rubbing down , to help you see high and low spots when sanding....also as a bonus helps you track your progress on sanding !
Etch primer is primarily used on baremetal, high build/filler prinmer to help fix low spots, etc.

Tools, ideally you need a DA sander, either electric or air, and yes you can get wet/dry sanding discs for them

 

[Chipper]

I'd nab a decent spare panel to practice on first. You can see how even coats are, suss gun settings, paint mix etc much more easily than in a lumpy bay. Plus it doesn't matter if it goes a bit wrong.

Some etch is a thin wash just to get a bite onto the metal, not building like a normal primer. Others can build a bit more, like a normal primer.

A mist coat is as above and also a very light coat, you let it flash a little (solvents evaporate), then squirt a wet coat while the mist coat is sticky. Helps the wet one to grip, to avoid runs & sags.

The original paint must be 2k or something, surely wouldn't be enamel as we know it - maybe it's a translation or naming thing?

 

[superfly]

Before starting on the car I will try it on some sheet.
It will be a good exercice for me as it will be the first I am doing the job and I am concious of all the parameters which need to be consider and my skills (not very high)

I will take a picture of the sticker next time I am down to the work shop I have to say that I am very surprise about the "Enamel" mention.

I would love to avoid going near the baremetal if is not mandatory as I have to said it will be a lot of work and it is not required why doing it :-)

With you explaination I understand what is the mist coat now thanks.
So I have re-read the Primer section in the tutorial and there is still something I don't fully understand what is a "high build self etch primer ".

By re-read the Primer section, I undertand that we apply :
1- "self etch primer" only when we are starting from baremetal,
2- A mist coast (I suppose we obtain it by using self etch primer and thinner?) it is usefull to gain some grip for the paint.
3- Then the Tutorial mention "high build self etch primer" which I have to say is confusing me a lot.
Do you mind explain it to me?

I have done some respray with can before (to prevent rust on my van I am not proud of what I have done) but I only use a primer and the top coat.
So I am a bit confuse with the different sort of paint.

Thanks a lot for you help.
Cheers

 

[the snooper]

self etch primer is self etch primer whether its standard or high build, high build is just what it says it goes on thicker then a standard primer.
a mist coat can be any compatible paint which you mist over any repairs then once dry flat it back off if your repair is good you will flat it all off, if it has bumps then the mist coat will be left on the low spots.

if the paint on the car is in good sound condition then there is no point in removing it

you also said

anti stone-chip primer is a very good way to protect from rust as it is adding a sort of bitume protection on the metal?

stone chip is not bitumen and you will need the special gun to apply it, if you go near bitumen with paint it will melt it

 

[langy]

Your thinking of a guide coat, mist coat is your first coat before laying on a normal coat.

I'll give it a go answering !

Yes it's a good idea to paint engine bay with engine out

I would try to avoid baremetalling unless absolutely necessary...
,..using a flap wheel could remove the galvanised coating if used to heavily.

Not sure on compatability between enamel/celly
a mist coat is applied before rubbing down , to help you see high and low spots when sanding....also as a bonus helps you track your progress on sanding !
Etch primer is primarily used on baremetal, high build/filler prinmer to help fix low spots, etc.

Tools, ideally you need a DA sander, either electric or air, and yes you can get wet/dry sanding discs for them

 

[Coo]

ahh, right...my bad . cool, I've learned something today

 

[superfly]

Sorry lads,
but i am get confused, based on what I understand a mist coat is like a guide coat but for primer.
Is this correct?

sorry if I am a bit slow.

 

[langy]

The terms usually used are Guide coat where you puff on matt or satin black onto primer before flatting, the other is a Tack/Mist coat which is a light coat of primer or paint before putting on the main coats.

Sorry lads,
but i am get confused, based on what I understand a mist coat is like a guide coat but for primer.
Is this correct?

sorry if I am a bit slow.

 

[superfly]

hey lads,
I took a picture of the sticker which is in the close to the battery tray about the enamel paint.

What do you think ?



The car is a porsche 924 from 1980, I am a bit surprise that it is enamel.

Or it is not what I think it is?

Cheers