Bondo Work

[Chappie]

If I am trying to create a mold to repair a bottom edge of a cabinet, what would I use and what type of surface would not permit the bondo to stick to it? Do I use like painters tape on my mold to prevent the bondo from sticking to it and when would I remove the mold? Thanks.

Steve

[EvilNuff]

I am by no means an expert but what I have done in the past is use paper around the area where the bondo would be applied and then just scrap wood around that clamped in place.  After the bondo has dried I just sand off the paper.  I'm sure there are better ways, however.

[The Lumberjackass]

try using tin foil / aluminum foil

i read somewhere , years back , that this is a good way to stop bondo / isopon p38 from sticking to a surface.

let me know how you get on , but just use a small amount first to see if it works or not

[javeryh]

Use Saran/plastic wrap!  It works GREAT.  I'm not sure if you can see but I wrapped some firewood kindling in plastic to get a nice straight edge on the back of my DK that had been really beat up.  The bondo dried and the scrap wood came right off after I removed the clamps.

[malelanct]

i've had luck with wax paper

[VanillaGorilla]

why do you clamp/mold it at all? If you can use a plaster knife with any dexterity, just apply it liberally in the area to build up material, and sand (36-40 grit) and file it down to shape. Alternatively, if you are replacing like a missing chunk, you could just back the area with cardboard and tape to give you something to 'pile it on'...I've done this literally hundreds of times.