still new to fiberglass

Ok i'm still new to this (only got one project under my belt which were a set of rear quarter panel speaker pods), and have a couple questions that i have no clue about how to do.

1. Where and/or how do you guys hide your screws on your fiberglass enclosures/custom FG pieces? do you counter sink the holes and try and put them as far out of site as possible?

2. After my 1st project, i found out how messy and hard to work w/ fiberglass mat and resin was to work with.  I've found a couple products that i think would become invaluable for all my future projects, let me know if they're worth it, or if there's an alternative/ trick to laying and measuring out FG and resin.  Im checkin out getting all 3 "Roller Tools" and the "Deluxe MEKP Dispenser" http://www.mobilesolutions-usa.com/smartparts/fiberglass.htm

3. When covering a finished FG project with Vinyl or Suede should i "pre-cover" the piece or box w/ a layer of material or padding before laying the final material over the top?  For my first project i had an old hot rod buff (great w/ mechanically and upolstrie[sp]) wrap them for me in this blue suede like material (pretty thin) and he told me he had put a thin layer of padding over it to help hide some of my horrible sanding blemishes and also to make it soft.  Like i said horrible sanding job so next project will be done right this time.  Does anyone else ever use padding before wraping?

4. This brings me to my last question, What are the basic things i'm going to need for all of the sanding required w/ fiberglassing?  So far all i've got are a couple of Wal mart sanding blocks, a 6'' flat hand sander (don't know exactly the name of whats it called,but it's blue and you put sandpaper strips around it that's secured by pins that stick up), and just my two hands.  Now for curvier/smaller pieces should i get a good palm sander? What brand/one is the best overall? which one is cost effective?  Anything else i could put on my list of things to get? 

I've recently dove back into the whole fiberglass thing while also getting my feet wet to working w/ wood/MDF.  I just got a nice jig saw and router combo to start this hobby which will hopefully turn into a career!  I'm working on getting a new digital camera so i'll post pics of my progress and pieces.  Knowledge is the only thing holding back my creative imagination from producing other works of art as seen throughout this forum! 

Thanks guys any feedback would be greatly appreciated!  You'll definately be seein me around!

RED

What are you building that you would have screws that need hiding?   If you are making a sub box with a fiberglass face on it you shouldnt use any screws, only staples to attach your fleece to the rings, give a little more info. 

Measure the amount of resin you think you can use up without it gelling up first, trial and error on that one, get lots of scrap cardboard and gloves, it is messy for the most part, experience will save alot of mess.  Cut your mat into workable squares, normally about 3-4" squares is what we like to use.

the padding is up to you and how you want the project to come out, I covered the last box and amp rack with suede only but it was finished well enough to paint, its all up to you on that one.

The best sanders we use in my shop are a pneumatic 3" right angle grinder with 36 grit discs on it for the big break down, we then use a 3" DA sander with 80 grit on up to 220 grit discs, you will need an air compressor for this but these are the most effective sanders we have used in my shop.