After some time researching, I have come to the conclusion that there is one method which is suitable for protecting the inside of 4130 tubing. Swash/Swish Boiled Linseed Oil around the inside of the tube. In practical terms it is easy, cheap and effective. The literature mentions that it is only necessary on the structural lengths such as longerons. The reason for using boiled linseed oil rather than just linseed oil is that the boiled variety dries quicker rather than staying too wet or runny.
I will use this method where possible and have recently found that it is available in some of my local hardware stores. Locally, I get it from Bunnings or I can also get it from Blackwoods (p/n: 03972708) here in Sydney. I believe that this product is used within the woodworking industry and is fairly common.
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