Don't use 'Silfos'.... Color match is brutal.
Take the time to set-up everything nice and square and you don't need to fold anything either...
Things you need:
- $10.00 bottle of Propylene, MAPP or PROPANE with the 'finest' tip you can find..
- A few sticks of "CopperPhosphate" or otherwise known as "Copperphos" (Contains NO Silver and the Color match is just about PERFECT..., also NO FLUX is needed for this, as it is a 'Self Fluxing' composition that actually works !)
- 100 grit or finer piece of sandpaper
A) Sand your edges on both sides of the copper sheet ALONG with your Copperphos ROD, then wipe down with dry clean cloth. B) Bind the copper sheet together as you would like it. Keep it down TIGHT, as the heat will obviously try to move it. C) Turn on the Propylene (not the same as MAPP) and gently pre-heat the SEAM from left to right (or whatever you prefer) and then keep tapping the rod into the heated joint / seam until it starts to flow. Once you have that going, move the heat and the rod (while still gently tapping) and you'll get a good flow going. Before you know it, you'll have a nicely bound seam that won't come apart and will likely be the EXACT color of your copper. D) Once cool, move to the next part and follow the same steps
**If you need to keep the other areas cool, you can use everything from THICK, WET RAGS to DRYWALL MUD as a heat shield.Good Luck,
/MM