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Scorpio

Im undecided as to how to strip the existing paint before a respray.

The car has in the past had two full resprays so paint is quite thick..and i found it can chip off in some spots.

I dont want to remove the galvanised coating

My options are

1) paint stripper ( will it remove the galvanizing aswell????)
2) orbital grinding to bare metal( will probably remove alot of galvanizing)
3) orbital sanding to remove a few layers of the paint.

Bead/sand.etc blasting isnt an option

Any ideas?
_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

Min · Posted: Mon Sep 29, 2008 1:38 pm Post subject:

blast it with walnut shell or plastic bead? I know you said it isn't an option ... but why not? heh.

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

Scorpio · Posted: Mon Sep 29, 2008 2:07 pm Post subject:

i guess its not that its not an option but more that i dont have the equipment..and its a bit expensive to have done

. actually ive got a 60 litre compressor can pick up some blasting material...mm whats needed for a home blasting job min?? how long does it take??
_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

Min · Posted: Mon Sep 29, 2008 2:38 pm Post subject:

well, if you already have the compressor you have the biggest most expensive part. Buy a small siphon feed sandblaster(30 bucks maybe?) and put the tube in a container of media, press the trigger. Just need dry air, and media. Biggest problems are, the mess it makes (gets everywhere) and the cost of media (if you control the mess, you can sweep it up and reuse it) It will take quite awhile, took my buddy about 20 minutes today to blast off his intake manifold in my shop. So for a whole car, a couple weekends of work? If you use walnut shell, or plastic bead, it should just remove the paint, not the metal at all. Since the metal is harder than the media your using. If your really interested in it I'd probably recommend building a pressure assist blaster. I can email you some plans for one, it would make the job much easier overall, and you can use a much lower pressure (meaning you will be less likely to damage the galvanization)

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

Paul · Posted: Tue Sep 30, 2008 9:25 am Post subject:

Wet sand off just the paint, leave the primer. All you need is sandpaper and some friends and a few bottles of Bundy.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

Scorpio · Posted: Tue Sep 30, 2008 10:26 am Post subject:

Adding media blasting to my repoitre would be an awesome skill to have..
min can you send me that building a media blaster pressure thing info?

Im sure i could random orbital sand down to primer in an afternoon then 600 wet sand to finish..

Or paint stripper in a few hours

Paul · Posted: Tue Sep 30, 2008 10:37 am Post subject:

Bundy is like air and sex, you don't think much about it unless you're not getting any!
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

Min · Posted: Wed Oct 01, 2008 3:23 pm Post subject:

sure, whats your email address?

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

If you want to take it back to bare galved metal a heat gun and blunt scraper is effective but slow. With practice and patience it could be scraped off to the original primer.

Joes924Racer · Posted: Wed Oct 01, 2008 4:45 pm Post subject:

thats a big job thenk god our cars are really sosmall.paint stripper is messy.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

924aussie · Posted: Wed Oct 01, 2008 8:01 pm Post subject:

Just the place for you Scorpio to spread out....

$50 a sq meter under cover, alarmed very close to Redbank Railway Station, ( Brisbane Qld ) saw the sign today and will try to arrange some photos if interested. Total area 1200 sq metres.

And it has a realy realy realy BIG compressor

Alan

_________________
green 924 .. 1980 rego 924PSH
1998 Mopar Neon ... sick
2003 Challenger / Montery 4WD
1995 Hyundai Scoupe ... sold
1998 Nissan Silvia ... sons back from OS he has taken it
BIG BLOODY MOTORHOME 300zx Sold
1980 Fire truck Sold

Scorpio · Posted: Thu Oct 02, 2008 7:24 am Post subject:

alan funny thing is i was actually looking into some industrial warehouse space last night!.. just confirming $50 sqm/pa ?

is that 1200 sq/m a minimum amount..ie would we need to lease it all?

i needed some space to do

1) car work
2) wave tank testing for a engineering project im working on

What do you think of setting up a single spray booth in an industrial shed...charge around $350 to $500 for use...for a 6 to8 hr period as brisbane has none of these.. that way rent could pay off itself!
_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

924aussie · Posted: Thu Oct 02, 2008 11:10 am Post subject:

have PM ed you

Alan
_________________
green 924 .. 1980 rego 924PSH
1998 Mopar Neon ... sick
2003 Challenger / Montery 4WD
1995 Hyundai Scoupe ... sold
1998 Nissan Silvia ... sons back from OS he has taken it
BIG BLOODY MOTORHOME 300zx Sold
1980 Fire truck Sold

peterld · Posted: Sat Oct 04, 2008 10:40 pm Post subject:

Hiya Scorp. Bare metalled my toofah some years back with paint stripper. Did a great job, and does NOT remove galvanising unless you are injudicious with the paint scraper.
Basically i did a section at a time - half a bonnet, then the other half and so on. Liberally coat with paint stripper (must be good quality, buy from auto paint wholesalers) and wait while it bubbles. Then simply scrape off and wipe mess on old newspapers. If paint is really thick then you may need several coats, but unlikely if you spend the dollars on good quality stripper. Oh and wear disposable gloves - the stripper bites.
Wipe over with wetted rag several times to neutalise stripper and finish with thinners or metho.
Took me less than a day to do whole car, including inside the door jambs.
Cheers Pete

Smoothie · Posted: Sat Oct 04, 2008 10:52 pm Post subject:

This one goes on for 5 pages, but the stripping's covered within page 1 -
http://www.924board.org/viewtopic.php?t=19177

-and another -
http://www.924board.org/viewtopic.php?t=20353
_________________
"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox