Honda-SOHC

CB750s are selling for silly money where I live (Ireland) - I’d love one myself but nothing to be had for less than 7k that isn’t a basket case. 

The top of the tank looks like rusting from stone impact.
The sides looks like a chemical reaction between undercoat & top colour.

No the paint overall is very good - as good as original apart from the bubbles. No chips, impacts, marks or discolouration anywhere. The photos really don’t do it any favours at all and a combination of surface dust, reflections of all sorts in the background and low resolution make it look horrible. Perversely, the badges come out perfectly.
I had to give it a rub of a rag to remove some dust that settled on it in the garage and didn’t get it all off. I posted the original pics to WhatsApp as a lazy way to reduce the file size so I could post them here and the result is it looks like a dog - images are only 400k in size so any dodgeyness is mostly coming from that.  Colour and finish are very good all over - which is why I was wondering if there was some way to halt the decline.  It’s still much too good to go respraying it any time soon.
Might try taking a better pic tomorrow or digging out something in better weather from before.
Thanks everyone for the feedback so far.  Definitely going to do something with the badge though. It really IS that bad.

Photos as promised. I had to drop the resolution to make the attachments fit and it makes the paint finish look like crap but it's quite good apart from the bubbles. Excuse the state of the badge.

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I got the tank and side panels of my 550f resprayed about 12 years ago and they turned out very well. The orignal tank had been scuffed and rusted from a tank bag and (as the previous owner explained) an unhelpful landlady who wouldn't let him wash the salt off the bike after his weekly commute up the A3 in winter to London from the south coast. Most of the paint on the top had been abraded down to and beyond the primer.  Fast forward some years and in Ireland and I got a very nice spray job done on it with new decals etc - you can get an idea from the avatar pic. But in the last few years some very small blisters are starting to appear underneath the paint here and there. Luckily not anywhere I come in contact with the tank, and just a few for now - two or three patches about the size of a thumbprint.  I suppose the rust was going to manifest itself eventually. Nothing serious just yet but in time the bubbles will crack and flake if left alone. The inside of the tank is ok and was cleaned and resealed and there's no issue with that, no pinholes or leaks - it's purely surface rust that's now reappearing. I wonder has anyone had any success in treating something like this, or slowing down the progression?  It looks almost like it is gas bubbles and not flaking rust underneath. The bubbles are quite small - 1.5mm max wide and half that amount in height. The tank still looks very pretty for now but longterm I think it's a lost cause, and will need a paint job again in the future. But I'd be interested in your thoughts on it. I'll try to take some good pictures in daylight tomorrow.
I suppose the upside is a respray takes us into 2035 and beyond. I hope I'll still be riding then.

Glad to be here - It’s great to link up with like minded folks. Thanks for making me feel welcome.  Hopefully I’ll contribute something useful at some point. For now I’ll figure how to post a few pics of my pride and joy.
Need to pare down the file size to get them to attach so maybe mightn’t happen tonight.

Hello from Seamus in Ireland.
I got my 1979 CB550f in the UK about nineteen years ago in anticipation of the eventual mid-life crisis. I paid £302 for it, winning bid on eBay. Spent many times that since on TLC and it’s definitely my favourite bike. I’ve been on the US site for a while and only became aware of this one today.  I also have a few other small Hondas from that time as well. Lovely machines all.