Hi Angry Ang Mo, the graffiti writing culture is quite underground in Singapore but the numbers of practitioners are growing in numbers. U should head down to Somerset skateparks or the National Youth Council (adjacent to Cineleisure) to look at the wonderful pieces there updated by local writers. It is a legal wall anyways and u can spray there, provided u have to paint with respect.
Recently, theres a group of business makers brought down montana cans. But unfortunately, i heard that they no longer sell them. But im not sure. Here's the link to their website :
www.backalley.com.sg . And im sorry that there is no graff shop around here in SG.
Most of the local writers prefer "Nippon Pylox". Other substitution for colours would probably be "Anchor" spray (Got them at ArtFriend) or RJ london or others. U can get these from any hardware store (Provision shops or DIY store) Be warned tho' that this is just industrial paint and tend to suck. And it does not provide any special caps/tips with it. U have to get them here:
www.scriptone.multiply.com (The cap fit for pylox paint)
Well, hopefully ive answered any of your questions. If u have any enquiries, do post it here n i'll try to help you as much as i can. And yeh, Michael Faye is a total joke to the graff community. Peace~