heh - mate; seems like you are encountering the problem I had when I 1st started down this route
yeah the kit from halfords is pretty good for small projects should be enough to do a helmet and some armour
it does add up if you are planning bigger projects eg full set of armour etc
2 types of FG material
1. cloth - its a sheet
2. chopped strand matting - sheets, my personal fav.
3. tissue - indeed its mroe bitty; think cotton candy like, not bad for fine corners, but to use this for swathes of surface; its just a pain
examples here -
http://www.ecfibreglasssupplies.co.uk/store/-c-42.html?osCsid=307b565297fd75e6f4a2592ea191b49c
once you get in teh swing of things - you may want more of the stuff (it gets cheaper too!)
this is the shop I use, failing ok shippin, but mroe importantly its local to me.
but look in teh yellowpages - boat repair or fibgreglass merchants.
bondo is any body filler you get at a auto shop
in UK - easiest source is Halfords
also known as Isopon 38 (small pots), btu as usual, larger pots are cheaper
I use this stuff -
http://www.halfords.com/webapp/wcs/..._productId_203155_langId_-1_categoryId_165625
good luck mate