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So if my plan was to re-finish the rifle in one of Norrell's Moly Resins would anodizing the metal even be necessary?
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No
In this case wouldn't I just be able to remove the original anodized finish and apply the Moly Resin to the bare metal?
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You don't seem to know what anodization is. Anodization is not the finish. It is the hard, protective cover made of aluminum oxide that grows out of aluminum when it is subjected to an electrical charge in the presence of an electrolytic solution (acid), or left in open air for a very long time. It is very hard (aluminum oxide is what some sandpaper is made of) and protects the very soft raw aluminum from dents, scratches and wear. If the anodization is removed, it should be re-treated to restore the protective qualities.
I realize you can apply Moly Resin over the existing finish but Norrell recommends for the absolute best finish to apply it on bead blasted metal.
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I believe that they don't recommend bead blasting, but sand blasting in cases where you are working with bare/raw metals. Applying it over blueing/phosphate results in a very nice finish. The only thing they recommend if you are applying it over another finish is that you make sure that the base finish is in good condition and that it is securely bonded to the metal otherwise the base finish may separate which will take off the moly coat too.
Also I'm concerned about the finish being too thick with both the anodizing and Moly Resin being applied.
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As previously explained you shouldn't remove the anodized surface. The Moly goes on with an airbrush, so it is very thin and won't affect the dimensions to any great extent, unless you put it on too thick.
If I'm being crazy someone please let me know. Thanks.
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Not crazy, but you have a lot of research to do before you decide what you want to do. As suggested, you should do a search on anodization to get an idea of exactly what it is if you are intent on removing the existing anodization and dye from the aluminum parts. If you're just going to overspray things with Moly, then make sure you read the instructions and follow them precisely. The color, gloss and flexibility of Moly is affected by the pre-treating temp and the baking temps. If you are expecting to use the moly (or any finish) to match colors between parts, you are in for a lot of work. They can come very close out of the bottle, but you won't get a 100% match without repeated attempts, adjusting temps, coverage and making color, tone and gloss adjustments. If you tell us exactly what you are looking for and what parts you are planning on re-finishing we may be able to provide additional suggestions.