inner diameter tube polyurethane coating

hello! i would like to get some advice on what type of resin should i choose.
i want to make a resin coating on the inner diameter of a tube. The way the
coating will be made is the following. Firstly, i will put in the tube a large quantity of resin and then i will push a ball throughout the tube. the ball should have a 4mm-smaller diameter from the ID of the tube so a thin film of resin to be formed.
do you have any suggestions on what type of resin or specific which exactly product should i use?
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