Working on door corner choose soldering ,that is sanding and tinning a small peice of galvanized tin over the small rust holes near corner ...I use Forney red (red ruby ?)tinning fluid .I bare and area to be patched make a matching patch from good thin tin 18 or 20 guage .The tinning process goes like this ...a coat of thr mentioned tin fluid is applied with a brush it is then heated till it drys , and then dabbed with clean water and a clean rag...you should see steam as you cool the hot metal off immediately after fluid is heated with a propain torch ....Okay then you repeat what you just did again fluid heat, clean rag moistened in clean water, After that you re apply the red tinning fluid then taking some good solder like oatey "50/50 ...you apply heat ' to the panel useing a half inch torch tip flame.Heat and solder are contacted to the metal simultaneously "rub' the solder while pushing on a length of solder wire.The solder should flow onto the metal if you do this right"... I prefer to dodge around a little leaving small drops stuck were the patch edge fits. .The patch you lay on a block of wood and tin prior to placement or soldering. Once' the 2 metal surfaces are tinned" try leaving a little extra solder on each half place the patch over the hole/s area take a screw driver and push the panel down apply heat with the propain torch to say a 5/8" area rite were the screwdriver is being pressed.the tin will melt then melt the solder under neath it might deflect a small bit towards the main body stop heating this takes about 7 seconds to achive... then take a wet wash cloth and dabb the heated area fast steam will come off the hot spot (you can get burned)..if the first spot is not stuck move around the patch doing the same thing...with screwdriver torch and wet rag .hints the screw driver will try to slip when ýou are pressing 2 if to much heat is applied to too much of the patch you may loose some of the solder by it falling out 3 some solder can be fed into the edge of a patch where its needed, 4 wear a paint respirator respirator wear googles .5 use expensive solder as many types just will not work. Clean any tinning fluid residue out oth the patch well or it disagrees with bondo okay it could be said to use jb weld to seal edge of patch then the filler process (bondo)...knock patches down a little with a hammer befor filler is applied if the patch falls loose you did it wrong.Remember tin the patch metal as well as the body
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