Tape - Tape is effective for holding
bundles of aluminum together, BUT when you pull the tape off, the glue
can remain on the metal and it is almost invisble. If the glue is not
removed it can resist the anodizing process and leave bumps and bare
Welding - If you are going to weld parts
together, make sure that you use a welding rod that is compatible with
anodizing. The wrong rod can turn jet black if used by mistake.
Close Tolerence - Be sure to inform the
anodizer if your parts are close tolerance so he can take precautions,
as the process can change the tolerances.
Alloys - Be aware that different alloys can vary slightly in colour when anodized.
Foreign Metals - Metals such as steel, brass, stainless steel will dissolve rapidly in
the ANODIZING PROCESS and should be removed before anodizing if
Water - Try to store your aluminum so that it's
clean and dry. Water in the form of rain, if it's outside, or even
dampness if it's inside, can cause corrosion and pitting to form on the
surface. This can result in a poor finish.