I'm a bit of an odd-ball, Brett.... I don't just paint what I can see.. I paint everything.
When I stripped the insides of the bumpers back to the "faux" chrome - I painted a few coats of fishoilene over them to seal them out.. leaving a few days for each coat to glaze over.... when I was happy with the coating - I sprayed enamel undercoat on it.... then top-coated it with White Knight epoxy enamel in "aluminium" color... that was the bumpers and over-riders.
I did the same to all the bumper irons as well.. but by this time, I'd been painting other sub-floor stuff with White Knight hammered metal Charcoal... I do like that colour.. gives the impression that it's very clean steel. The coating goes quite hard over summer and it's probably as good a protection as you can get without going to POR15...
What you can see in those pix are all White Knight epoxy enamel... with aluminium on the bumper and over-rider internals.... and hammered metal charcoal on the other bits...
I'll see if I can find a pic of more of the underneath.. a lot of it is POR15... but the sills and some of the rear floor and up the boot walls are W/K hammered metal.. I find it good paint.. it can almost be "plastered" on to build whatever thickness you want... as long as the steel is well sealed with fishoilene and undercoat... the top coats do the heavy lifting to protection under there....
See if I can find some pix to add here...
- rear floor 0002 mail.jpg (104.68 KiB) Viewed 275 times
The pix are out of order... the first one should have come up second...
The sills in the second pic show it clean again after a rub down with some soapy water and dry off with a towel..
The next pic shows what it looked like after getting back from a run over road works which were wet ... sills picked up a bit of muck on them .. but the rest of it stayed pretty clean... needless to say, it was all sparkly new looking again after a scrub up...
I like to go over looking under the car every now and then (with a wet rag in hand)... checking for stone chips.
The POR15 is mainly up the front on the toe-boards and under the front guards where the front tyres tend to create havoc with anything which can chip... also a fair bit of it down the back where the rear tyres throw stones up as well..... so far, not one chip in POR15 yet.. and we've been over some fairly rough territory ..
- axle housing centre 004 mail.jpg (89.99 KiB) Viewed 275 times
The two pix below is of the rear underside..
- 001 underside rear left mail.jpg (127.58 KiB) Viewed 274 times
- 001 underside rear right mail.jpg (113.05 KiB) Viewed 274 times
I might further throw in some suggestions to anyone who wants to go this far.. or anyone who wants to add a bit more protection to the underside....
I use "butyl-mastic" on all the gaps between the floor and top-hats.... and also the openings around the jacking point frames. I did this after the undercoat went on.. then painted more undercoat on after it had cured enough to paint....
Further, I drilled drainage holes in everything under there which could trap water... the jack frames, top hats and sills are all open to drain at the lowest point on all of it...
With the holes, drilled - I could push a flexible dip tube into the area and pump fishoil in using an aerosol can... plugged up the drainage holes first, left for a few days to penetrate - the removed the bungs and drained out the excess fishoil...
I go way what most people would with my old bus to preserve it.. I lost a sub-frame to rust (left front corner).. I know what a build up of crud can do.. and, whilst we are on the subject - please... everyone! - go to Clark rubber and get two 1" blanking rubbers and fit them to the holes for the socket to enter for removing the outrigger bolts... that's what killed my sub-frame... all the rubbish and debris that went into it through these two holes in front of the radiator baffle... and - drill holes in the bottom of the sub-frame to allow any water to get out.... it can't go "uphill" over the crossmember mounts... and it will well up if the two pathetic little drain holes at the front corners block up - and they will... please check these and take action..
if you want more - happy to post up... including pix of it in red enamel undercoat..
frats,
Rosco