new to forum, couple questions about my fiberglass box...
I just finished a fiberglass sub box for my 2001 Mazda MP3 (coincidence?) Everything went smooth; the structure is solid, sounds nice, fits like a glove. I have everything i need to paint it and I would like a piano type finish to it. I have sanded it down and primed a couple spots. For the most part, it looks lumpy? or wavy. I have applied some body filler to certain areas, but i think i did it wrong (applied filler, dried, sanded it all off until only little holes r filled, plus i used an orbital sander) What is the correct method of applying body filler to smooth it out and get rid of the waves and lumps?