Thought it would be worth mentioning this site to forum members.
They supply all materials for modelling and are ideal for the scratch builder.
The site is well worth studying as the more you look the more you find.
They are also on Skype so they can show you their products face to face.
I have just bought a 500ml can of Plasweld for about a tenner, the 57ml bottle sold by most other people costs roughly three pounds fifty.
Worth a look.