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Yes and no.
Your radiator cap should keep pressure in the system at a safe level. No matter how much coolant you have. However on the Uno the built in "radiator+expansion tank" -systems "overflow cap" venting holes are very small so maybe they couldn't put out the coolant fast enough. This is all speculation on what really happened, maybe it was just old age.
The reservoir was in the trunk and the system capacity was about 25 liters at one point. When it all got hot, expansion was about 1.5 liters, in a system designed for less than 0.5. A fully functioning system will spill this out into the expansion tank, the Uno however spilled it from the weakest spots. Lowering overall pressure and causing boiling.
So in other words, if your car's cooling system is good and can hold a little higher pressure and your radiator cap works, you're should be fine. You will need a bigger expansion tank though.
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