Advice for clear coat - total noob

Seeking advice re finishes for an outdoor rocking horse we have made for my daughter. My father, husband and I have built a rocking horse (unicorn actually) and we are kind of stuck as to finishing it, being our first real woodworking project. I'd like advice on a clear top coat that is UV stable and won't turn our lovely white unicorn yellow and will preserve the coloured details underneath. It is made of pine and some areas filled with builders bog. We are going to apply two coats of bullseye 123 primer. Sand, then apply a flat white exterior paint (just regular house paint). I am going to paint coloured details like the mane and tail and decorative flowers in waterbased acrylic craft paints. I've searched the threads but most advice applies to preserving woodgrain and natual wood colours. Can anyone recommend a suitable clear top coat that will protect the coloured acrylic and resist yelllowing (the unicorn will live outdoors under a shady tree). Thank you for any help you can give.

Marine clears like the Bondall are fantastic: Bondall 1L Gloss Monocel Gold Marine Clear Timber Varnish - Bunnings Australia

They are made for boats, so this application wont bother it a bit.

I've used the marine spars and still have a can :)

These door finishes work too: Intergrain 1L UltraClear Gloss Exterior Timber Varnish - Bunnings Australia


On the pine, it will yellow no matter what you do. It is its nature.


edit - since its also going over acrylics in places, I thought another option would be clear coats for cars. These will work too: Dupli-Color Touch-Up Paint Top Coat Clear, PS117 - 350g | Supercheap Auto

Thank you so much! I will take a look at these products and feel much more confident about it now. I appreciate your time in replying :)