Resin Bonded Sand Moulds
Description:
You mix a resin and a catalyst with DRY sand, forms a mixture similar to petrobond. You use this to ram up one side of your mold. After a period of time it sets up to a porous sand stone consistency [A lot like insulating fire brick]. You then turn the mold and repeat the process.
Pros:
- Easier to touch up
- Much easier to make multi part Moulds
- Seems to get better detail
- Mold can be made days/weeks before pouring
- Makes very good cores
- Vents and sprues can be molded separately and added to your mold separately. This way you can have tall sprues and vents without using a lot of sand.
Cons:
- Sand is not as easily reusable
- Cost is higher than green sand or petrobond
- Mold is affected by moisture over longer term.
- Working time of resin is a little short after mixing.
- Mixing is a pain {No worse than mulling}
