re-painting a radiator?


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PedroTQ
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1988 GL-1500
1998 Valkyrie

re-painting a radiator?

Post by PedroTQ » Wed Nov 29, 2017 4:38 am



G'day to All :-)

Well I have spent the last week cleaning and polishing my 98 Valky for the forthcoming Charity Rides, I didn't realise she was so dirty :shock:

Anyway, I am returning to the rebuilding of my 90SE, the radiators are in good enough nic for re-use (not that you can buy new ones anymore - "Discontinued").

The old radiators have lost most of the black paint and the fins are chockers full of smushed insect guts. I will be bead blasting them over the next couple of days and cleaning them up as best as I can.

My query is;
should I give them an "Etch Primer" first, then the black engine paint?

or just paint them engine black?

I am concerned that all the coats of paint might insulate them and not transfer the heat out successfully enough?


Many thanks in advance :-)

Happy and Safe Riding to Everyone, Peter.


#1 - 1975 GL-1000 - showroom
#2 - 1976 GL-1000 - sidecar
#3 - 1978 GL-1000 - RIP
#4 - 1975 GL-1000 - RIP
#5 - 1978 GL-1000 - RIP
#6 - 1988 GL-1500 - Soon to have sidecar fitted
#7 - 1998 GL-1500C - Valkyrie
#8 - 1990 GL-1500 SE Soon to be Flagship

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tfdeputydawg
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Re: re-painting a radiator?

Post by tfdeputydawg » Wed Nov 29, 2017 9:08 am

Are you sure bead blasting will not damage the thin fins????
If would consider letting a radiator shop boil them and ask them about proper paint method.

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bellboy40
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Re: re-painting a radiator?

Post by bellboy40 » Wed Nov 29, 2017 9:31 am

I think I would use a pressure washer from the back side of the radiators and try to wash the debris out the front side. Don't get the wand too close to the fins though because they are easily bent or damaged. Then spray a light coat of paint on them.

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Erdeniz Umman
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Re: re-painting a radiator?

Post by Erdeniz Umman » Wed Nov 29, 2017 11:20 am

Arter cleaning with unpressurized water, I would just paint it with heat resistant black paint.

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Charlie1Horse
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Re: re-painting a radiator?

Post by Charlie1Horse » Wed Nov 29, 2017 10:55 pm

You are correct about putting too much paint on the radiators. It will impede the heat transfer process. Talk to a radiator expert and find out what kind of paint to use. Some kinds of paint will not last on radiators. You could get the right kind of paint and thin it substantially to use an airbrush to just put enough to color the front, the side that can be seen. As for bead blasting, I wouldn't go that far because after years of service the fins start to weaken a bit and are more fragile.
Russell

Those who say it cannot be done should try not to interrupt those who are doing it.

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Mh434
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Re: re-painting a radiator?

Post by Mh434 » Thu Nov 30, 2017 2:15 pm

I agree wholeheartedly about avoiding bead blasting - those fins are almost as fragile as aluminum foil.

High-pressure steam, on the other hand, will not only remove all the bugs & their entrails, but will get rid of every trace of oil, grease, and dirt, without damaging the fins or the cores.

As for the paint, well, it would be tempting to use those fancy shmancy chrome grill covers to hide the radiators, rather than try to paint them. Without the aforementioned steam cleaning, paint won't stick anyway due to all the road grease between the fins. Once that's done, you could paint them...still not sure it's a good idea though, as it may adversely affect their heat transfer to the air.

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PedroTQ
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1988 GL-1500
1998 Valkyrie

Re: re-painting a radiator?

Post by PedroTQ » Sat Dec 02, 2017 3:10 am

Thanks for the feedback Guys, and sorry for the delay, my wife got pulled over by our over exited dog on Walkies, took the skin off her nose, bottom lip and elbow then fractured her right arm in two places. she is not happy :cry:

she is right handed and now has difficulty signing the government documents in the toilet before faxing them off to parliament, so I have to give her a hand for everything around the house.

As for the radiators, I will just clean them heaps then fit them as is, :D

Another disappointment is my new to me sidecar outfit on the 88 is too wide, maximum width in West Aust is 2M, and she is 2.06 Metres wide, so off she is coming for a new set of mounting hardware to be manufactured.

Happy and Safe Riding to Everyone :D
#1 - 1975 GL-1000 - showroom
#2 - 1976 GL-1000 - sidecar
#3 - 1978 GL-1000 - RIP
#4 - 1975 GL-1000 - RIP
#5 - 1978 GL-1000 - RIP
#6 - 1988 GL-1500 - Soon to have sidecar fitted
#7 - 1998 GL-1500C - Valkyrie
#8 - 1990 GL-1500 SE Soon to be Flagship

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curtm
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Location: Aylmer,Ont.Canada
Motorcycle: 91 GL 1500 SE

Re: re-painting a radiator?

Post by curtm » Sun Dec 03, 2017 6:53 pm

Just did mine the other day, i used a soft brush to remove old paint etc(careful not to bend fins over), then used hight temp paint, 2 real thin coats, looks awesome
Curt



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