Powder coating on the interior of an hydraulic tank?

? Some powders might come off with some oils. You haven't told us what powder you use? Nor what oil is in use?
But why coat it at all? What is your reason for putting a coating on the inside of an oil tank?

A. The hydraulic oils I have come across contain some fairly aggressive solvents... I would suggest that you apply an epoxy based powder or even epoxy/phenolic powder (there are a few around). Anyone with any alternative ideas?

A. Hi John. Although I don't know what kind of tank or oil you are referring to, or what material the "fresh" plates are made of (hot rolled, cold rolled, galvanized) ... I think the question is really whether pretreatment is required; and the answer is yes, proper pretreatment (phosphatization) is required before painting. So if the plates can be properly phosphatized without blasting, that sounds fine. Good luck.

Regards,

A. Hi John. I agree with Ted's comments. Depending on the media used, the roughness will probably increase. Blasting is sometimes preferred for this particular application but there are other methods that can be used to prep the material for further processing.