Reflection of light.

I know Mylar is the best reflector and after that would be smooth white paint.

But i was in a shop today and they were selling Thermal Blankets.Very thin

Im not to sure of the material but they are coated with aliminium,

Would these work well if i taped it to some card board and hung it above my lights to shine the light down?

Usually those blankets are mylar.

That is sweet. Been looking for mylar in my area and no one sells it. I have seen thermal blackets though.

Anyone know where to get mylar from besides ordering it online?