If the original paint it is still there.... go to the car paint shop and get yourself 2 cans of U-POL #1 clear coat. That's like car clear coat in a can, will take less than a day to dry. It is ready for you to touch after 15 to 30 minutes. Obviously if the weather is bad just put it under some UV light or heat (70 degrees will do).
Advice, rattle the can like for 10 minutes and put it in a glass with hot water so the can heat a little bit, (the paint will flow better this way specially in the winter) then rattle it again, then put it the hot water again like 10 minutes... then go and paint. (follow the instructions because it is easy to get orange peel ok?, do a test 1st so you could figure it out ok?), 1 light coat.. let it seat... then a wet coat... done.
This thing is super toxic and super sticky so get a mask or something and be careful with your fingers or you will ruin the job. When all is done you will have a super shiny clear coat.
Good luck.