Is it ok to sandblast the underside of a hood and decklid? Would it show warping thru on the topside?

Not if you do it right.Generally there isn't alot of paint on the under sides so shouldn't need to much blasting to get to metal.I had my cowl hood,doors,fenders and frame done by a pro.He told me if done RIGHT none of it should be warped.And my stuff had ALOT of paint on it..
It's all in how the blaster works the noozle and how much he cares...

graemlins/waving.gif
Rick

So it could then. I don't have that much confidence in my blaster. He has a very large noozle. He blasts big trucks, horse trailers and stuff. I had my brackets and frame done there.

John, I have sandblasted sheetmetal and have had it done with success. However, I will never recommend ANYONE try.

It is the easiest way to DISTROY a panel. I am not talking "Oh darn it, I have some more work to do" sort of damage. I am talking "HOLY $&*# I have totally ruined it and have to throw it away! kind of damage.

This distruction can be done with a large industrial blaster as well as your little siphon unit at home hooked to a 4 horse compressor.

There are other ways such as using 3M ROLOC or Clean and strip discs. It may not be as fast but at least when you are done you will not have a distroyed panel.

Thanks MARTINSR, I was hoping you were lurking and would respond. I think I will pass on the blast and get me some stripper.

Jim
i blasted the underneath of my deck lid over 2 years and the sand still comes out of it alot no way to get it out the other thing is when i went to paint it some of the sand ended up in the paint next time i use a DA sander and hand sanding i don't recommend doing it and as martin said ive seen many panels get ruined with a sand blaster

I agree that sandblasting the underside hood and trunk will result in sand getting into nooks and crannies that you will never get out for years. I suggest the 3M roloc discs and elbow grease. I just did my underside hood. When I started it seemed like a horrible large task. But with patience it ended up nicely prepped, and painted fine.

Ive seen some pretty deadly stuff done to cars with snad blasters. If I could find them I would post some pics I took of a 67 GTO that a guy blasted completely. Sorry but when you can see all the waves and ripples in bare blasted steel YOU KNOW YOU JUST FU@$ED UP.

Sand blasting sheetmetal to me is so not worth the risk. Ive done succesfully but think i got lucky to be truthfull.

When time comes to strip my current(rust free :rolleyes: CA) 70 chevelle, its headed to the media blasters, who uses platic beads. I cant even buy the sand for what this guy charges. Plus if you DONT get all the sand out, it will absorb moisture- RUST. But plastic on the other hand wont...Eric

How did you locate a shop that uses the plastic beads?
Dan
++++

whats wrong with a chemical paint stripper?.

Getting my frame and other stuff blasted was a breeze. I was hoping to do the same thing on just the underside because of all the nooks and cranies. Thinking about it though, the sand would bog up in the corners and nothing would get done in there anyway.

Dan, call around to body shops and you should find one in LA. Crown Chevrolet in Dublin up here in the bay area does it and has for a number of years. They started in the early nineties when GM had all the "peelers". They were doing so many of those peelers that they didn't even do "regular" customer jobs. Check with the dealers in the area and one may be doing the same thing.

FO_FDYFO (your profile is one of the best ever smile.gif ) Stripping the under side of a hood with stripper? It gives me the HEEBEE JEEBEES just thinking about it! :eek: :eek: The stripper would be stuck in all the nooks and crannies and NEVER come out! You only want to strip nice flat panels and only with the seams taped off with duct tape. Sand all those areas. Under the hood, there "usually" isn't a big paint build up, rust is the usual. And of course stripper will do nothing for rust so it is a moot point anywho. smile.gif

I had the same thought. I wanted to go without the insulation and have nicely painted underside. Unless I can get that part very smooth for detail, I guess the insulation is a must.

Jim, that is in my "Basics of Basics" to detailing, (sorry, I have never typed it up to post). Priming it up and surfacing it could be done. If it has a lot of pits, polyester primer. File the edges of the holes so they are all nice and clean and surface it to perfection.

Detailing is FREE, it takes little skill. Only time. smile.gif

THANKS. ;)
the one time i used paint stripper on the underside of a trunk lid, it was my 66 nova. it did not have rust (i dont know why i thought i had to take it down to bare metal, it was a long time ago graemlins/clonk.gif ) i hosed it down with tons of water. i never had any problems from doing that. what i reciently have done with my trunk lids and hoods is have them acid dipped. that removed all the rust, then i used undercoating nozzles to spray por-15's metal prep, metal ready and paint inside and out. then i took the pars to a Ze-Bart place where they sprayed rust proofing all inside of it. the top outer surfaces of cource i put metal etching primer, primer and paint. gee i hope my nos cowl hood does not rust! graemlins/clonk.gif