Silverone858 Posted November 15, 2014 Share Posted November 15, 2014 (edited) My z is an incomplete project my friend started, since the car is torn down as far as it is I'm going to go a little deeper than he did. My friend dealt with the rust on this car with a wire wheel and Por15, the entire interior floor, engine bay and front wheel wells. I want to cut out and repair a few areas of rust, stitch weld, complete the frame rails to the rear and roll cage. I'm wondering what I can do to get rid of the por15. -soda blasting - looks like eastwood has a 100# blaster, and from what I read the 80/20 mix says it will "The soda media will remove urethane, epoxies, enamels and lacquer top coats along with virtually every primer and filler for automotive and marine use" - media blast - What media is best? How can I keep from warping the metal? -Wire wheel - I don't think I can get into every nook and cranny. -Por15 remover - terrible stuff I hear, can I throw the used chemicals in the trash when I've stripped the por15? Thanks in advance for your help! Edited November 16, 2014 by Silverone858 Quote Link to comment Share on other sites More sharing options...
ritrebor Posted November 16, 2014 Share Posted November 16, 2014 Try soaking with brake fluid. It should remove Por15. ritrebor Quote Link to comment Share on other sites More sharing options...
socorob Posted November 16, 2014 Share Posted November 16, 2014 Be very careful with using mig gas with high heat with brake cleaner= mustard gas. Not sure about with brake fluid. Quote Link to comment Share on other sites More sharing options...
Chris_Hamilton Posted November 16, 2014 Share Posted November 16, 2014 Soda blasting is the least (safest) aggressive. If that doesn't work (kinda doubt it will) try plastic. http://www.northerntool.com/shop/tools/product_200321271_200321271?cm_mmc=Google-pla-_-Abrasive%20%2B%20Sand%20Blasters-_-Abrasive%20Blasting%20Accessories-_-155686&ci_src=17588969&ci_sku=155686&ci_src=17588969&ci_sku=155686&gclid=CM2Os4vE_8ECFezm7Aod6DsASw Warping is not a issue with soda blasting, plastic is relatively safe as well. With plastic and anything more aggresive like sand, silicon carbide, etc use the lowest amount of air pressure in your blaster that will get the job done. Ideally you don't want to use sand EVER, it'll warp a panel very easily and it causes something called "hydrogen embrittlement"....basiclly sand and Silicon carbide will work harden sheet steel. If you have access to a oxy-acetylene torch and the area to be stripped has had anything that could be damaged removed you could try torching it and see how that does. Use a slightly acetylene rich flame and fan the heat around. Be careful to not get an area too hot as you can warp the metal. If you do it right you can heat it and it will release and be easily scraped and wire wheeled away If you are not comfortable using a torch then I would suggest you stick with plastic media. Quote Link to comment Share on other sites More sharing options...
Silverone858 Posted November 17, 2014 Author Share Posted November 17, 2014 Be very careful with using mig gas with high heat with brake cleaner= mustard gas. Not sure about with brake fluid. Hmmm mustard gas sounds great, this is exactly why I posted these questions here, I'm very hopeful that the soda blasting With the 80/20 mix will do it tho I like the torch idea too. Tomorrow is Monday Itthink I'll try to call the Por15 people and see what they suggest. Please any more ideas keep them coming! Quote Link to comment Share on other sites More sharing options...
socorob Posted November 17, 2014 Share Posted November 17, 2014 I think its because of the chlorine. Quote Link to comment Share on other sites More sharing options...
Chris_Hamilton Posted November 17, 2014 Share Posted November 17, 2014 Hmmm mustard gas sounds great, this is exactly why I posted these questions here, I'm very hopeful that the soda blasting With the 80/20 mix will do it tho I like the torch idea too. Tomorrow is Monday Itthink I'll try to call the Por15 people and see what they suggest. Please any more ideas keep them coming! I don't have a clue if brake fluid will strip it, but I wouldn't worry about any gas side effects if you remove the brake fluid before you weld. Use a Automotive Grade wax and grease remover like "PPG DX330", a cheaper alternative would be "Klean-Strip Prep-All", and in a pinch you could also use lacquer thinner. Wipe the area down then use a clean prep towel, or paper towels to re-wipe the area you just wiped. That will remove any trace of the brake fluid. As long as you don't have any puddles of brake fluid anywhere you would have no reason to worry about "mustard gas". Quote Link to comment Share on other sites More sharing options...
socorob Posted November 17, 2014 Share Posted November 17, 2014 I was using the mig a long time ago and had brake cleaner sitting on the cart when an old welder friend of my dad came in. He saw it and told me about it. I looked on the can and sure enough there was a warning for it. I went home and googled it and found this: CHLORINATED HYDROCARBON SOLVENTS Various chlorinated hydrocarbons are used in degreasing or other cleaning operations. The vapors of these solvents are a concern in welding and cutting because the heat and ultraviolet radiation from the arc will decompose the vapors and form highly toxic and irritating phosgene gas. (See Phosgene.) PHOSGENE Phosgene is formed by decomposition of chlorinated hydrocarbon solvents by ultraviolet radiation. It reacts with moisture in the lungs to produce hydrogen chloride, which in turn destroys lung tissue. For this reason, any use of chlorinated solvents should be well away from welding operations or any operation in which ultraviolet radiation or intense heat is generated. Quote Link to comment Share on other sites More sharing options...
socorob Posted November 17, 2014 Share Posted November 17, 2014 (edited) Doubled Edited November 17, 2014 by socorob Quote Link to comment Share on other sites More sharing options...
socorob Posted November 17, 2014 Share Posted November 17, 2014 And I think back then I read about 15-20 people in the US die a year from this. Apparently it only takes 2 breaths of the stuff. Quote Link to comment Share on other sites More sharing options...
Silverone858 Posted November 17, 2014 Author Share Posted November 17, 2014 Wow that's kinda crazy! Just to think we use brake cleaner to clean parts all the time. Well I'm gonna look into renting a media blaster and give it a shot. I might give the torch a try also. Thank you for your help, I'll keep you posted! Quote Link to comment Share on other sites More sharing options...
johnc Posted November 19, 2014 Share Posted November 19, 2014 Don't use brake cleaner on anything that will be heated or welded. Acetone is safer and cheaper then brake cleaner. You have to physically and chemically remove the POR15 from any surface you intend to weld. We get old Porsches in the shop that have POR15'd floor pans and suspension pans and its cheaper for the customer if we cut out and replace the entire POR15'd paneland replace it with a new then to chip, wire wheel, scrape, and clean the areas to be repaired. Quote Link to comment Share on other sites More sharing options...
Chris_Hamilton Posted November 19, 2014 Share Posted November 19, 2014 Heat has been the only thing I found that will work on the stuff John. Like you said sometimes it's easier to cut it out and replace. BTW I googled Benton Performance and it seems like a real nice place to work. Looks like you guys do some very high quality work there. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted November 20, 2014 Share Posted November 20, 2014 Look for non chlorinated brake cleaners such as MOC. Quote Link to comment Share on other sites More sharing options...
johnc Posted November 20, 2014 Share Posted November 20, 2014 Thanks Chris. Yes we do some pretty amazing stuff with old Porsches. We also have two S30s in the shop right now. One is a full restoration on a 11/69 build and the other is a 2016 Peking to Paris Endurance Rally car for a father and son team. Quote Link to comment Share on other sites More sharing options...
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