seam welding ?'s and help.

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hello all,  im getting ready to weld the seams on myrally car project. most of the welds arebutt welds on 18 gauge sheet metal. the sheet metal ranges from 16gauge to 20gauge. what i would like to know is...  -what wire size should i use?  -whats the best gas for thin/dirty sheet metal?(i use c25)  -whats the best way to weld thin sheet metal invertical position?  -anyone know the best way to clean up the seamsand seam sealer??       thanks fellas. heres some pics of the car...
Reply:i use 030 wire for sheet stuff  and i weld down on the thin stuff... try a few diffrent 2lb spools of wire like 023 and 030 and the c25 is fine.. and dont forget to tack the hell out of it, sheet metal warps like crazy !!!!!!!!!!the cleaner the better, spend the ime and PREP the weld area and make sure you have a good GROUND  did you do the cage ?pretty neat.... where are you going to race it ?brian
Reply:hey arc dog! I appreciate your help. I did not do the cage. at that time i didnt trust my welds.my friend at www.gtfabrications.com did the cage. he's anawesome welder. heres the link to my car on his page: http://www.gtfabrications.com/customer/as/gallery.htmI'm going to race the car in the scca club rally and westernstates rally series. amar
Reply:1. 023 wire2. migs do not like dirt...clean them up ...then c25 will be fine 3. down 4. wire wheel....cosmoline
Reply:WOW! thanks for the great advice guys..started welding yesterday and i must say...the results are great.i like the 023 wire...my welds look better when i use it.