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Question:

Is aluminium Foil porous?

When i use aluminium foil for cooking, the fat that leaves the food, ends up on the underside of the foil and on the baking tray surface.

Answer:

Warm Loft Insulation
No, it is not I have done the same thing, and you have a leak in the foil, perhaps you laid two sheets overlapping, or a cut in one sheet The sheet has to be large enough to cover the entire tray with extra so the ends can be folded upOverlapping two sheets does not work.

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