Hi Maggie, just so we're all on the same page, SureJell (which is a pectin-based product) isn't the same as Instant ClearJel and will likely perform quite differently when it comes to stabilizing whipped cream. When it comes it Instant ClearJel, we know that it tends to clump when added directly to liquid if it isn't mixed with sugar first, so it makes sense to couple the amount of Instant ClearJel in relation to the sugar. If you want a comparison of liquid to Instant ClearJel, it's approximately 1-2 teaspoons of Instant ClearJel per about 397g/1 3/4 cups of heavy cream. 

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