radiation
By radiation
aluminum coated fiberglass.
Steel and aluminum are rather neck and neck with quality. Both can be coated to prevent corrosion. In the end, price is where they differ with steel being the slightly less expensive option.
Most satellites and space vehicles are made from an aluminum or titanium alloy, or composite material, and then coated or anodized to prevent oxidation in space.
Steel cans coated with a thin layer of tin to prevent rusting of the steel. If the can contents are acidic a further layer of polyethylene is added to the inside surfaces.
These surfaces absorb radiated energy better.
linen
To prevent it from rusting.
The flux is there to remove any oxidation from the surfaces of the metals to be welded.
Platter
to prevent stickons put oil............
A mango seed will not germinate if it is coated with pomade. This will prevent the seed from germinating and growing.