Console building materials

Hi guys, i've never done a console before, but i've been reading a lot and it doesn't seem so hard, i'm pretty good with fiber glass. From what i've read some people use fiber glass to fill the gaps and other people use some type of plastic paste. My questions are what works better, and where or who sells the plastic paste and texture spray to complete the job, specially the texture spray i haven't been able to find it. Any assistance will be appreciated.

im sure somewhere like schucks or autozone should have what youre looking for.  possibly even lowes.  another thing you could use is expanding foam.  you can get that anywhere, even places like kmart.  not sure which works better tho, since i havent tried both yet, just fg and bondo.