it is possible but VERY difficult. You will need to match the resin in color and measurement. It you add too much mekp the resin will be slightly darker/hazy. To less and the resin will be weak and just crack again. To be honest it isnt worth the hassle
well, if you sand it down there will be haze to it. B/c it will have tiny scratches on it. If you get it so smooth, and put a layer on top, it is possible to still see that the hood was messed with. One major reason is that there may be air bubbles when you apply it. It is also very difficult to get the resin even, that is one of the main reasons why bondo it used to fill low spots. Your best bet is to fix the cracks then paint it. If you really want to try that on your hood pm me and Ill give you a more detailed explaination.