I absolutely love making Free Form Bowls, you don't even need a mould. You can use hot glue to create your shape and diameter, although I have not used that method personally. I like to feel safe, so I have always used a round or fluted mould. There are a few benefits to making free form bowls and I don't know all of them. This is great for beginners, because the end result, more often than not, makes you look like an expert Possibly the most well known benefit is reducing waste or as I prefer to call it 'A Two-ffer' Two for one. When making vases the run off of resin is captured in a mould beneath the vase. The final design is very often ad-hoc, but rarely displeasing. Once the resin is no longer tacky, but still soft, fashion it into the desired shape. I use two plastic bowls or, one bowl and a lot of packing tape and anything I can find to shape the bowl. Using a heat gun can help to get the desired shape. There is no right or wrong way to do this, more often than not, it depends on the mood I am in at any given time. Never, put the packing tape directly onto the resin. Cling Film [Saran Wrap] is a good barrier between the packing tape and the resin, it also stops you getting finger prints on the final product, unless that is either how you sign your work or is a design feature. Be aware that sometimes Cling Film can cause wrinkles in the resin, depending on what stage of the curing process it is in. My first bowl had the wrinkle design feature and I didn't use a mould actually, or technically at least. I covered the glass plate from my Microwave in Cling Film and poured the resin on to that, hence the wrinkles, which now of course I claim to be a deliberate design feature and I'm sticking to it. I would like to say, the final design was calculated, and deliberate. The reality is, WOW! was I lucky that day. The outside of the final bowl very much resembled a Tortoise shell, including the colour. The inside of the bowl resembled the underneath of a Tortoise, including the colour. My GP now has it, because he loved it. Sadly, I never got to take a photograph, it was barely cured before he claimed it. How did he get to see it I hear you ask, long and very boring story.