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new panels with black paint or etch primer??

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cnfabo Custom Title Time!

1,353 posts · joined Apr 2008 ·

#973241
Hi guys was wondering about those panels you buy with the black paint,is it etch primer?? Just curious if it is then I can just block it and shoot my high build over it..

Thanks
Fabo

68BUS Wolfsburg Wizard

485 posts · joined Jul 2011 ·

#973249
Too late after.
Strip it off i reckon.
1966 Aussie 11 Window

Peter Leonard Moderator Volatile

1,456 posts · joined Apr 2003 ·

#975100
you can bet it isn't etch primer 🙂 you can test it by rubbing at it with various solvents, but the EASY way is to run it down to the sand/media/soda blasters and have them give it the treatment. And take pics. I used Absolute Blast in Landsdale and they did a nice job of a box full of bits and pieces for $80.
let sleeping dubs lie

Crispy Commited Dubber

54 posts · joined Dec 2012 ·

#975776
buzz it back with 80g or file finish depending on type of job, ensure bare metal is coated with either an etch or epoxy before primer

cnfabo Custom Title Time!

1,353 posts · joined Apr 2008 ·

#975779
Thanks guys ,its all been primed now..

Might give the boys at landsdale about blasting my pan,will save me so much work and not to mention mess....

Peter Leonard Moderator Volatile

1,456 posts · joined Apr 2003 ·

#975785
thing that bothers me about blasting a pan and larger bits is that there are bearing surfaces and nooks and crannies where the media shouldn't get. I spose if you mask it well enough it should be okay. bit like people who acid dip engine cases and wonder why they're screwed afterwards.
let sleeping dubs lie

cnfabo Custom Title Time!

1,353 posts · joined Apr 2008 ·

#975786
Peter Leonard wrote:thing that bothers me about blasting a pan and larger bits is that there are bearing surfaces and nooks and crannies where the media shouldn't get. I spose if you mask it well enough it should be okay. bit like people who acid dip engine cases and wonder why they're screwed afterwards.
She'll be right!!!!!!!

Peter Leonard Moderator Volatile

1,456 posts · joined Apr 2003 ·

#975787
cnfabo wrote:
Peter Leonard wrote:thing that bothers me about blasting a pan and larger bits is that there are bearing surfaces and nooks and crannies where the media shouldn't get. I spose if you mask it well enough it should be okay. bit like people who acid dip engine cases and wonder why they're screwed afterwards.
She'll be right!!!!!!!
unless she's an engine case 😉 post up some progress pics you lazy bugger 🙂
let sleeping dubs lie

cnfabo Custom Title Time!

1,353 posts · joined Apr 2008 ·

#975796
Peter Leonard wrote:
cnfabo wrote:
Peter Leonard wrote:thing that bothers me about blasting a pan and larger bits is that there are bearing surfaces and nooks and crannies where the media shouldn't get. I spose if you mask it well enough it should be okay. bit like people who acid dip engine cases and wonder why they're screwed afterwards.
She'll be right!!!!!!!
unless she's an engine case 😉 post up some progress pics you lazy bugger 🙂
Lol,honestly I'm a bit over putting pics up,it takes me so long as I'm a spaz on computers,actually I don't even have one I only have a tablet and I'm even worse on that,lol.....when its done I'll put pics up....I'm almost ready to high build it then put my colour on....

Peter Leonard Moderator Volatile

1,456 posts · joined Apr 2003 ·

#975900
cnfabo wrote:
Peter Leonard wrote:
cnfabo wrote:
Peter Leonard wrote:thing that bothers me about blasting a pan and larger bits is that there are bearing surfaces and nooks and crannies where the media shouldn't get. I spose if you mask it well enough it should be okay. bit like people who acid dip engine cases and wonder why they're screwed afterwards.
She'll be right!!!!!!!
unless she's an engine case 😉 post up some progress pics you lazy bugger 🙂
Lol,honestly I'm a bit over putting pics up,it takes me so long as I'm a spaz on computers,actually I don't even have one I only have a tablet and I'm even worse on that,lol.....when its done I'll put pics up....I'm almost ready to high build it then put my colour on....
in the immortal words of several Adam Sandler movies: "You Can Do It"

take a photo with your mobile and load it up, or email it to me and I'll also be over posting the pics up for you 🙂 .

Hopefully this weekend the clear coat will go over my 'new' tinware, AND i'll post pics. eventually.
let sleeping dubs lie

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#976100
Peter Leonard wrote:thing that bothers me about blasting a pan and larger bits is that there are bearing surfaces and nooks and crannies where the media shouldn't get. I spose if you mask it well enough it should be okay. bit like people who acid dip engine cases and wonder why they're screwed afterwards.
acid dip engine cases, like vw ones?

duh! they are made of mag so yeah acid will eat it in no time. (in minutes)

unlike a cast iron block, acid dip will clean it really good and not harm it one bit.

media blasting is fine, its the operator who is to blame if anything goes wrong.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

Peter Leonard Moderator Volatile

1,456 posts · joined Apr 2003 ·

#976556
apparently soda blasting is reasonably mild as the particles explode on contact with the material instead of staying solid like tiny projectiles of evil that rip into it, but I read that on a soda blasting website. The heat generated by the friction of the media smashing into panels can warp them, but again this is usually due to operator error. Of course the end result is the same whether it's operator error or not- a bunch of work left for you to do to fix it.
let sleeping dubs lie

helbus Administrator Mad fabricator, paint and body

7,386 posts · joined Sep 2002 ·

#976579
Media blasting with sharp stuff like garnet, causes millions of pin pricks in the surface of the metal. If it is a thick panel frame or chassis, this is fine. On thinner panels it causes the surface to expand. So when the outside surface gets bigger than the inside metal, the panel warps, or basically trys to turn itself inside out. It is not just a heat issue.
EJ22 into Bay Microbus - Finished project build thread- click on this spot here for info

Peter Leonard Moderator Volatile

1,456 posts · joined Apr 2003 ·

#976602
Yup, I imagine it's a bit of both- like when you paint one side of a board and it absorbs moisture which expands that face, making it bow/cup.
let sleeping dubs lie

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#977500
helbus wrote:Media blasting with sharp stuff like garnet, causes millions of pin pricks in the surface of the metal. If it is a thick panel frame or chassis, this is fine. On thinner panels it causes the surface to expand. So when the outside surface gets bigger than the inside metal, the panel warps, or basically trys to turn itself inside out. It is not just a heat issue.
I been telling people that for years, but people insist its all heat.

I have done tons of sand blasting in the past, even I had blasted a part for several min on the same spot its only just warmish.

I warped an aluminum panel in 5 sec to the point as you describe as turning inside out. the middle ballooned out 50mm above the plane of the panel. the panel was 250mm x 400mm off a PC case. And no shit when I said in like 5 sec. There was no heat involved in this.

glass beads is what I was using when this happen.

soda should be fine as long as it doesn't have contamination of other hard media in it.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE