If you don't mind getting a bit mucky, invest in some ramps and axle stands so you can get the vehicle high enough to work under safely, with the emphasis on safe.
I suspect the rust isn't too bad in the main bodyshell, it's probably poorly or unpainted suspension parts and subframes that are worse for wear.
I'd buy a 4 litre bottle of ACF50 or a 5 litre can of chain lube, chain lube half the price of ACF50, then wire brush and sandpaper off whatever rust you can get too and spray your chosen product over the affected areas...put down a large polythene sheet under the whole car and let it sit for a day to drip after the job is done, you can spray inside the box sections door skins sills and from the inside of the boot and wheelarches the hidden water traps.
CastrolCL greas is waterproof that would make a reslilent covering painted onto subframes and easy to access suspensio parts.
Try and cover the brake discs as best you can and buy a can of brake cleaner to get any overspray off the discs, try also to avoid the exhaust, you can help the exhaust by painting with good quality zinc.
I suggest the above products because they will seep into the rust not just cover it which is what most of the wax finishes do, such wax finishes look better when done but they don't eat into the rust like a wet oil based product, in fcat they peel as the rust reforms trapping salty water inside after a couple of years, back to square one only worse.
You'll do the whole job better than the pros for about £100 tops plus the cost of 2 ramps and two axle stands and a hefty trolley jack to lift the car onto those stands, say £250 all in and you've got the jack, stands, ramps for ever.
I've had a pick up professionally proofed, only the one time because i learned i can and do a better job myself for about 1/4 the cost, every years i just pop under a do a quick top up spray to replenish whats washed off.
Good overalls, hat goggles mask, its a filthy job but worth doing.
PS, i could lend you two Spaniels and a Hungarian Vizsla, they'll help, er ish, tail wagging helps spread the muck about no end :-)
Edited by gordonbennet on 18/06/2020 at 20:53
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