So I've got the tank off, and, despite gagging from the diesel fumes, it seems like an hours detour is in order, to Waxoyl those hard to reach bits.
Off to the parts shop. Yikes! that spray gun is every bit the same as I remember it from my teenage years (trying to get Waxoyl inside motorcycle frames, etc.). Still, if they're still selling it, it must have been improved. Perhaps it now works...
Get the kit home, duly warm can in hot water - all goes nice and runny. This'll work a treat. Distant memory of having nothing but trouble priming the thing, so decide to prime it before crawling under. Primes fine. Crawl under. Squirter and hoses are now solid. Give up in disgust for the day.
Overnight warm up and empty hoses, rinse with white spirit. All functional again (supposedly). Decide I was doing three things wrong: not adding white spirit to thin it, not keeping can in hot water bath, priming when I shouldn't. Resolve to do all differently next morning.
Tweet tweet! The dawn chorus in Henleaze. Fill bucket, and immerse freshly thinned can - solid becomes liquid. Gingerly fit hose to top of can and carry assemblage to back of 110. Crawl under, being careful not to (a) splash hot water on overalls, (b) squeeze trigger by mistake, (c) lose any of the hose bits, which seem intent on self-disassembly.
The moment of truth. Insert hose in chassis. Squeeze trigger. Fluid does indeed seem to flow. squeeze again, and again. Fourth squeeze, pipe goes solid.
[now for the REALLY stupid bit] In desperation, whip off tube and replace with normal nozzle - if we can't do the insides, at least... Aim squirter at chassis. Whomp! Normal nozzle leaves squirter with (small) sonic boom and trail of nearly solid Waxoyl. Heads straight for large hole in chassis which I'd been using to feed pipe down. Disappears into innards.Retire to house to dry off (kicked bucket trying to escape and got soaked in hot water). Almost resolve never to try this again, but thought I'd ask here first...
What's the secret (or is Waxoyl just as dreadful as it was 30 years ago)?
Regards,
Simonm. (PS: I find a caving helmet is excellent for this - it looks daft, but it's a good place for the lamp, and doesn't hurt if you bang your head).