Hi! You'll do this in After Effects. A tutorial on the basics, to get you started, is here: Use alpha channels, masks, and mattes in After Effects Here's the instructions though. 1) Use the text tool to make your type as you like it. 2) Import you petrol rainbow layer. One way to make an easy one is create a solid, add fractal noise, then add colorama. Then change the colors in the Output Phase. 3) Place the rainbow layer above the text layer. 4) Change the blending mode to Stencil Alpha OR duplicate the text layer and place the duplicate above the rainbow layer, then change TRKMAT to the rainbow layer. 5) Use a mask on the rainbow layer to do the reveal animation.
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