Silicone Mold Making Kit 20A, Platinum Liquid Silicone Rubber for Mold Making, Fast Cure & Food Safe Silicone Mold Maker 38OZ, Ideal for Casting Resin Molds/Silicone Molds 1:1 by Volume

I found this easy to use and worked well. I used an adjustable mould and poured equal amounts above the top of my template. Leaving to set overnight, it came off my template easy. Resin models peeled out easy .

Works well and makes a very good mold.

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Really pleased with this. It was easy to use and did almost what it says on the tin. I had no difficulty using it. Although there were a few negatives. There is barely any odour from it. It stays pourable for a nice long time giving plenty of time to mix thoroughly and slowly pour a few castings. It is sufficiently forgiving of mix ratio that small batches can be done by eye in the measuring cups (in one place where I got some extra splashes of one part it didn't set properly, but this bit wiped off fairly easily). It was always set by the stated 6 hours. Once set it is very flexible and tough but also rigid enough to maintain its shape in use. It takes details extremely well - the features from an old European coin were taken clearly. I used a CNC to cut a pattern into a block of candle wax and then cast the silicone into that to make a mold for casting chocolate. The wax channels were 5mm wide and the silicone flowed well through them. First casting I dribbled the silicone along all the channels and especially into all the corners before letting it flow on it's own and it came out fine. Second time I poured at a single point (as recommended) and I ended up with a few voids where bubbles had formed. So experiment. I think my mold may be unusual in being thin channels. I did 3 castings from one wax pattern and 2 from another. They all released from the wax just fine without damaging the wax (without using any release agent). The 5mm channels in the wax are obviously the walls of the chocolate mold. These turned out to be thicker than is probably needed. I may have been better making them thinner (maybe 3mm). However the walls were still sufficiently flexible to allow me to extract 5mm outlines of chocolate without breakage. (I wish the chocolate had been as easy to cast !). With whatever was left I experimented with - pouring around various reentrant disk-like objects. In each case I managed to prise the object out and make an ice casting so this seems a viable technique for duplicating things. The down sides. The seal on part A was not fully attached (as other people have said). Fortunately the top was tight so no spill, but this could have been a disaster. It comes with pipettes - these are useless because it is so viscous (it takes 10 seconds to fill one and then it does not fully empty, so useless for by-volume and too slow for by-mass except for tiny amounts). But measuring out with the cups is good enough. I found it impossible to do a thorough job of mixing without trapping tiny bubbles and these were reluctant to settle out, although mostly the surfaces of the mold did not suffer due to it. After 6 hours setting it is still "sticky" (not tacky, just a bit grippy) but washing in hot water soon sorts that (maybe the heat accelerates the curing). In any case I waited another 12 hours and several washes in boiling water before using with food.

Perfect

Placed Nylon 3D printed items onto clean glass plate, using double sided tape, and taped a mould retainer around the outside, and placed on perfectly level surface. Mixed 50/50 by weight or by volume, it's more or less same and had a beautiful turquoise coloured liquid. Poured gently and slowly around items ensuring all the lowest nooks and crannies covered. The resultant mould is lovely and after a little clean up to remove flashing I am sure will be fine. Very runny, and will find the smallest gaps and textures. Ensure all is clean. Doesn't like double sided tape adhesive, as these areas stayed liquid/gooey, but luckily for me these were not critical area of the mould. Will bubble and degas as it reacts and sets, and have spotted one teeny tiny bubble in a non significant area. Anyway ... quite impressed so far, not bad for the first mould

I was a beginner using this silicone product very easy to use will be buying some more

Defective product, uncured and sticky after 16 hours. Also the viscosity is actually quite high, despite the description saying otherwise, so it's easy to get voids and air bubbles when pouring. Pretty much holds it's shape instead of flowing like a liquid.

My first venture into casting and mold making. This stuff works well, good value, and easy to use. Used it to clone a screw driver handle on to a locking bit extension so I could have a screwdriver with full size interchangeable bits with less slop and doesn't lose the bit.

Worst silicone I've used in 20 years. Cures unevenly, ruined 4 detailed plastic masters (all of which had been primed and sealed with acrylic sealer). Still uncured after 48 hours and congealing like custard. Very disappointed and will never use or recommend this brand/seller again.

This silicone 2 part system follows your original item well. It also releases from the original item very easily.

Startso World Mold Making Rubber is an excellent Silicone material. It mixes very nicely and introduces almost no bubbles. No vacuum chamber or degassing chamber needed. It flows well. And it being an RTV Platinum cured rubber, Startso World Rubber belongs into the top grade of rubber materials. Any 2 component material that has a mixing ratio 1:1 is easy to use. Just mix equal amounts by volume not weight mix THOROUGHLY - this is the most common mistake, not mixing the 2 components properly - it's also very important to often scrape around the mixing cup-wall, so the material sitting against the inside-wall is also mixed well. If not, the last bit that's coming out of the cup will be that material stuck directly to the walls - causing the top of the mold to stay sticky. The downside of these types of rubber they are expensive - very expensive - with this unit sitting towards the lower end, price wise it is a great choice for beginners who want to try out rubber mold making as well as for professionals. SRC chemicals - is typically my choice but having tested Startso's Rubber I will get more from them in the future. Especially when I need smaller amounts. I wish there was a 1 gallon and 2 gallon option here.

Very good quality platinum silicone . I made pumpkin mold and it turned out very good. Very easy to mix, doesn’t create bubbles. Very happy with my purchase.