Workbench & sticky back plastic vinyl

[PracticalTacticalBrilliance]

Hi,
we've got a workbench in our shed which has a chipboard (I think) tabletop and shelf, like in the attached picture.

It was in the shed when we moved in and isn't in great shape, it looks like it got a bit damp at one point, although it's dry now.

I was wondering whether I could cover it with sticky back plastic vinyl like they sell in B&Q/Dunelm/Wilko etc - do you think that would work?
I'm not sure whether I'd have to paint/prime the chipboard first, or if it could just stick straight on.

Many thanks for any thoughts!

I think I would paint the existing chipboard to tidy it up, or even replace it.

I've used a sticky backed marble contact vinyl on furniture in my room and I would say, yes, it would stick directly onto the surface, but it will also show up any dents and imperfections. I would sand the surface, clean it, and possibly prime it with some kind of a sealant if it's going to be in an area where it might otherwise be prone to damp. You'll also want to use a plastic scraper tool (like a debit card or something) to ensure you're taking out air bubbles as you apply it. If you can get someone to help you then it'll make it a lot easier. I did it on my own and while it's fine just for me, I still curse that lone air bubble I didn't notice at the time.

Chipboard is not ideal for sanding smooth as it comprises coarse wood chips with small air gaps in between. Sticky plastic probably won't stick anyway. Priming it with PVA will provide a better bonding surface, but it could be lumpy. If you want it looking really smart, just replace the chipboard.
You could just paint it with a gloss paint without the plastic.
For a really beautiful effect, you could decoupage it (using PVA instead of Modge, as its the same but cheaper).
A quick option would be to cover in a strong wallpaper (with a print you like - even a free sample), wrapping the edges and staple gun or clout nail edges.

Thanks all! I will have a think & have a proper look at it this weekend.

Or you could tile it.