I have been using this method for 30 years, no more thin runny whipped cream and your whipping cream will hold up for days this, is fabulous on cakes - for 2 cups whipping cream use 2 tsp gelatin in 2 tbsp cold water.
Mock Cream - This mock cream is also not as cloyingly sweet as the usual buttercream which invariably incorporates a copious amount of sugar. I had even tried substituting the water with blueberry juice and that worked just as well and gave the cream a lovely lavender colour!
How to make stabilized whipped cream frosting, just like on cakes from the bakery...best frosting ever! - This is a dream on chocolate cake and even the ladies that lunch won't turn down a slice of white cake frosted with it. Try a 2 layer yellow cake with strawberries in glaze in the center then frost the rest of the cake with this and garnish with fresh strawberries.