BBDINO Silicone Mold Making Kit, Super Elastic Liquid Silicone for Mold Making, Translucent Silicone Rubber Mold Making Kit, 1A:1B Ideal for Casting Resin Molds Silicone Molds 4.4 lbs (Translucent)

This silicone is labelled for mold making, but I've been using it to cast into alginate molds and it works great. Cured no problems at all and the hardness lines up well as described, feels around 5-10A shore. Takes dye no problems too.Vacuum degassing is necessary when casting, for anything that needs to be food/body-safe. The self-degassing works well for mold making but it still traps some very fine bubbles in a casted part. If near-microscopic surface bubbles aren't a problem for your application it's fine to use without degassing. The super thin viscosity makes it nice to work with in a vacuum chamber, doesn't foam up too badly and the trapped air comes out fast.

I've seen others give negative review of this product due to incorrect use related to using the silicone with 3D Printed models. For FDM printers, the silicone will do a great job, no extra work needed. For resin printed 3D objects, extra care has to be taken to prep the models for use with the silicone. Most importantly, you need to properly wash the model with isopropyl alcohool. You can not use any isopropyl alchohol that you've previously used to clean other prints. If you do, your molds will come out a guey mess like others using the product have noted.Use isopropyl alcohol that you've never used before to clean the resin print. Once washed, spray it properly with more alcohol. The key here is to have no leftover resin on the model - if this uncured resin (invisible to see) comes in contact with the silicone it will contaminate it and the silicone will never harden and the contact surfaces will be a guey mess. Once you've properly washed the printed resin model with alcohol, wash the model with hot water and dishwashing liquid (not in a dishwasher), using a toothbrush to get rid of all the alcohol. Then rinse the model with water so that there is no dishwashing liquid (or alcohol or resin) left on the model. Put the model in water and cure with UV light for at least 20 minutes. Keep the model in the water for a day (preferably under direct sunlight - while still in the water). Once done, let it dry properly - do not use a hair dryer for this. Blow air on it or let it dry naturally, you can also dry with a cloth or paper towel. Only once it has completely dried is it ready for use with the silicone. Hope this helps someone.

This silicone is ideal where you need a very flexible material which is also very robust. It’s easy to use being a simple 50-50 mix ratio. The working time is around 30 minutes but can be made shorter or longer by increasing or decreasing the ambient temperature respectively. I like the fact that it came with mixing sticks, disposable gloves and a nice trimmer tool.I have been successfully using this with 3d printed moulds made from PLA which are reasonably easy to remove, especially if you apply a little silicone based lubricant or Vaseline to the mould before pouring the silicone.

Worked well for my application, no bubbles or material that didn't cure

I wasn't sure about this one at first. I've used several different products that claim to be flexible for mold making, but this one left me pleasantly surprised. I thought I'd gotten the blue one, but the opaque white is just as good. It is really flexible and easy to mix. You do have to get the proportions just right, and I do recommend using a scale to make sure that happens, otherwise it does get a bit tacky. But, mixed right, this stuff is amazing. And it's just as easy to use as the easy cast resin I like to pair with it. Definitely will be purchasing again when I run out.