Yes they are.
The Concrete Worktop Premix Kit is extremely versatile and can be used. If you plan to use the kit in small batches, all you need to do is dry mix all of the ingredients in the bucket to make sure they are all blended together. You will need to weigh out the glass fibers according to the weight of the batch also.
It’s an easy enough sum. If you are weighing out 1kg of dry mix you will need 60 grams of fibres.