Tagging onto Phat's post...
When I redid the brake system in my '41 De Soto about 4 years ago, I used DOT-5, enticed by the promise of "no moisture absorbtion", and had a whale of a time bleeding the system out; no one (especially the manufacturer) warned me about "not aerating the fluid"!
That means: "pour carefully while filling the MC; don't create bubbles;if using a pressure bleeder, make sure is has a barrier diaphragm etc.".
Well my pressure bleeder didn't have a diaphragm, and I unwittingly made a DOT-5 frappe! :mad:
I finally let the car stand for about two days then went back and pedal-bled and it seemed to be ok.
Am also on my third brake-light switch, BTW.
The news about rubber "incompatability" further concerns me- I think that I will go back to DOT 4 & 3 fluids in the future when doing total system overhauls, and flush the system every couple years thereafter.
As far as paint damage goes, there's nothing wrong with using a funnel to help get the fluid into the MC only
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