You need to replace the fields, coating1, coating2, etc with a related table of coatings. Then you can specify different coatings in each such record and use that info to look up data from elements.
A commonly used data model is the "bill of materials" or BOM. It looks like this:
A set of BOM records represents the "recipe" for manufacturing one unit of product, recording the Material ID's and Quantities needed for each material. It's not uncommon for Product and Materials to be two occurrences of the same table such that any given Material can in turn have it's own BOM.