Dekulus said:
I'm going for the water and Tamiya method.
Isopropyl alcohol can sometimes be actively bad to add to regular hobby paints of this type, but even if it has no ill effects it might not have
any beneficial effect. I wouldn't bother with it myself*.
When paint dries out in the container the secret's in what you just said - the paint has
dried out. So what was lost by evaporation? Mostly it's exactly what you'd expect: water.
If you want to go one extra step then you might add a small proportion of ammonia (also lost by evaporation) but IME it's usually not necessary. As long as the process hasn't gone too far you can often get the paint back nearly to how it was when new just using water.
Dekulus said:
...as far as an extender to make the paint take longer to dry, can someone give me a link to eBay perhaps ?
To help looking for and buying the right thing, the additive to slow drying is normally referred to as retarder, not extender.
And I wouldn't bother adding this to the paint unless you're specifically having problems with it drying too quickly (most of which would be helped more by using a stay-wet palette anyway). It's generally better to use a retarder as and when you need it rather than add it directly into a paint pot - if you add too much the whole pot is a loss, whilst if you add too much to a small mix on the palette you can simply add more paint to that one pool of colour.
*If you already had some it would be worth experimenting with but you might not find any other uses for it, so it should hardly be high up on the must-buy list. It's particularly not a good buy in any hobby brand, where you'll be charged through the nose for it...
Einion
