Protecting the tamiya acrylics

As a lot of you guys know, the tamiya acrylics or all acrylic paints for that matter are very weak and scratches easily. What do you guys do or what clear do you guys use to protect it? I take it for metallic parts such as the exhaust pipe, you guys would use alclad?

You can use a clear coat to protect the acrylics, as long as it's compatible. Don't use anything too hot or it will eat into the paint and ruin it. Tamiya do a clear in their x series jar paints but it takes a long time to dry. Any of the Vallejo clears would work well over Tamiya acrylics and they dry a lot quicker too.
Alclad are a great choice for metal finishes and they have many shades in the range. You can also mix them to give an infinite amount of different colours.

Alclad also have some great clear coats, I'm using those almost exclusively now.