I am a beginner so bare with me. I have replaced sections of my floor and trunk and have sandblasted the inside and underside of car. My question is, should I epoxy primer all clean metal to prevent rust from forming due to my lack of ability to stay on the project. I have more welding to do, as well as any body work needed. Any suggestions? Also thiniking of sandblasting exterior? Not a good idea? thanks

Yes, epoxy primer it, then do any remaining body work over that.

As said, now is a great time to Prime the areas to prevent future rusting, specially if it may be some time until you can finish up the work.
I would advise you treat the areas with "Ospho" or any of the other Posphoric acid treatment products prior to the shooting of the Epoxy to give it a good clean surface and a Ph it will be attracted to to improve it's 'sticking power'.
Be sure to grind off any coating before you attempt to weld in that area again - the epoxy can not be welded-through and will contaminate the weld if it is not removed before welding. A wire brush or a 'Norton' "Rapidstrip" (#04015) used on your 4 1/2" grinder does a fine job of clearing away primer from areas to be welded without effecting the metal below if used correctly.

I use mostly PPG DPLF products and find that doing the final filling and body work over the primer works very well.

Oh - and that 'Sand Blasting' thing you asked about ... Bad Idea :wacko:
Sand blasting, unless done in small areas and by a trained and experienced person, can lead to severe panel warping and surface damage to the metal that can't be repaired.
You can find specialty companys that can media blast/strip vehicles for prices competetive with the sand-blasting guys. The type of media used varries by the guy doing it, the media used and the type of stripping being done. It is common to find Walnut shells at most of the shops I use around here. I heard soda and other media is more common on the east coast - don't know if this is true or not.

Hope some of this helps;
John

thanks chris for your response. I'll do that , I just couldnt see letting bare metal sit too long. What do you think about sandblasting body down to at least orginal paint? My 67 as four colors under white?

Thanks John for the info. I 'll stick to my original plan and chemical strip the top and have the doors and front clip chemical dipped locally. The rear of my car will be new metal. Thanks Brian

As said, now is a great time to Prime the areas to prevent future rusting, specially if it may be some time until you can finish up the work.
I would advise you treat the areas with "Ospho" or any of the other Posphoric acid treatment products prior to the shooting of the Epoxy to give it a good clean surface and a Ph it will be attracted to to improve it's 'sticking power'.
Be sure to grind off any coating before you attempt to weld in that area again - the epoxy can not be welded-through and will contaminate the weld if it is not removed before welding. A wire brush or a 'Norton' "Rapidstrip" (#04015) used on your 4 1/2" grinder does a fine job of clearing away primer from areas to be welded without effecting the metal below if used correctly.

I use mostly PPG DPLF products and find that doing the final filling and body work over the primer works very well.

Oh - and that 'Sand Blasting' thing you asked about ... Bad Idea :wacko:
Sand blasting, unless done in small areas and by a trained and experienced person, can lead to severe panel warping and surface damage to the metal that can't be repaired.
You can find specialty companys that can media blast/strip vehicles for prices competetive with the sand-blasting guys. The type of media used varries by the guy doing it, the media used and the type of stripping being done. It is common to find Walnut shells at most of the shops I use around here. I heard soda and other media is more common on the east coast - don't know if this is true or not.

Hope some of this helps;
John

John,

You mentioned using crushed walnut shells to blast with, Do you know of anyone who sells these online. Also do you happen to know if they require a special nozzle on the blaster?

Richey

John,

You mentioned using crushed walnut shells to blast with, Do you know of anyone who sells these online. Also do you happen to know if they require a special nozzle on the blaster?

Richey

Eastwood sells all kinds of media, but it's pretty expensive to shoot walnut or specialized media unless you have a good reclaimation process to reuse it.
http://www.eastwoodco.com/jump.jsp?itemID=1313&itemType=CATEGORY

I don't know of anywhere to buy media in bulk, but I'd be happy to know of one. The Northern Tool near my house sells media like Eastwood does in 50lb buckets, but it's about the same price.

John,

You mentioned using crushed walnut shells to blast with, Do you know of anyone who sells these online. Also do you happen to know if they require a special nozzle on the blaster?

Richey

I don't really buy this media, I have this work done locally. (I do buy Glass beads for a small cabinet locally)
If I was going to do the blasting myself, I would definately use something like Walnut Shells or Plastic media v.s. using sand with the Silica inhalation issues ...
I know he uses the medium to fine media and with a ceramic nozzle @1/4". Just in watching some of the work I would guess his stripping rate is @ 1~3 SFPM on the large panel areas.

I googled for a local supplier here and found - media supplier - http://www.ecoshell.com/Blasting.htm - maybe they know a distributor in your area. Or you can google for a sandblasting shop in the Odessa area and see if they do other media blasting and/or if they sell the media.

Hope some of this helps;
John

Before you have anything Chemically dipped you should read up on what the process will do to the sheet metal if the product is not neutralized properly. This process will cause sheet metal to deteriorate over time and also cause paint to blister. I have media blasted 3 cars in the past using glass bead, The trick is to not stay in one position for any length of time because that will cause heat distortion. I have purchased one of those enclosed car ports for cheap money and I am using a 20 gallon pressure blaster on a 60 gallon compressor that does the job nicely. The best media to blast with is the Poly bead,,but at $100 for 50lbs is pretty expensive. In the end what I have invested for what I have blasted I have saved over $2000. Good luck with your project.

thanks for the advice joe. I will research it more first.