3 replies to this topic

[ROWINGADUBAY]

I made a master out of wood coated it with e-tex to make it nice a smooth made a mold box and did about a 60% bondo resin to 40% body filler mix (wich I think would have worked awesome) everything looked great when I poured the resin before work when I came home I had a little trouble demolding (ruined my master) but not to bad until I looked where the E-tex and bondo melted together and made all kinds of funky swirl and krinkley marks.I am thinking I should have used a water born poly or a water based clear for the master I am thinking if I coat the inside of my mold with devcon I might be able to save it
any thoughts would be great
George

[mrbilky]

My only suggestion would be if you have to use a solid material for the master then I would use rtv as a mold material if you make your master out of a soft material then mold material can be hard.

[FuzzyGrub]

I have only used resin and hardner for molds. No body filler. I used soft masters with "hard" mold. A very thin coat of vasoline help seperate on hard surfaces. The more "hardner" that is added the hotter the reation, and the heat is what causes allot of the issues.

[smallmouthaholic]

All that work to be disapointed- although somewhat expensive CNC aluminum molds cannot be beat for 2-part precision , durability and the advantage to inject into thin appendage designs. They save time and $ in the long run.