Its a putty, that once mixed together, can be used to fill holes, make body kits etc...

We all use it and is easy to use. Once it sets, it can be drilled & filed smooth.

Cheapest place to get it is on eBay, about twice the price in modelzone.

http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT

I use it to fill holes, like when I did my Dub Mini & smoothed a few bits on an EsCos WRC.