I have made magnetic flush hatches for my CH16, and I have read in past posts that if you do not put a layer of fibreglass over the magnets they will rust.
My idea to stop this, is to put a layer of glass over the magnets but i need the layer to be as thin as possible so I thought vacumn bagging would achieve this but getting a pump and attachments in New Zealand(where I live)is extremely expensive so I am wanting to know if anybody has built a vacumn bagging setup at home and if so would you like to impart your knowledge to one how knows nothing.

Thanks for any help provided

Tony