Reply With QuoteI don't think it matters at all when you see how rusty some dishes are and the paint some have used and they still work well. I remember reading a thread on this topic on Vetrun as well some time ago.
Leroy
Sanding/Repainting a slightly rusty dish
Found a large KU Band Offset dish that has paint peeling off it and a moderate amount of surface rust only on one side.
Is it safe to lightly sand down the surface of the dish ? Not sure if this will majorly affect reflection angles of signal to focal point that much ??
Also is it safe to use zinc primer underneath to rust protect it? or will this impede dishes performance ?
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I don't think it matters at all when you see how rusty some dishes are and the paint some have used and they still work well. I remember reading a thread on this topic on Vetrun as well some time ago.
Leroy
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Strictly speaking, any degradation of a dish surface will affect performance to some degree.
Obviously, very weak signals will be the first to suffer, however, providing there is still sufficient signal strength and quality, it will still work.
Yes, you can sand it back and paint it and using a primer is a good.
The better-quality dishes are galvanised, then painted/powder-coated.
The important thing is to keep the thickness of the surface even, so spay painting is better than using a brush, although I've seen brush-painted dishes work fine, too.
It's best to use good paint/primers, especially made for metal. Use matt or semi-gloss to reduce the amount of heat reflected into the LNB.
If you don't already have suitable paint & primer, you may find the cost of buying it may be well on the way to the cost of a new dish.
Cool. Have some zinc primer and spare spray can of green paint when I was doing some rust repairs to the old datsun years ago
Use matt paint not gloss unless you plan to cook on your LNB when the suns in the right spot.
Min (12-09-11)
Good point. I remember a thread from years ago when someone painted their dish black and the LNB melted.Originally Posted by Godzilla
Use matt paint not gloss unless you plan to cook on your LNB when the suns in the right spot.
I have reservations about using Zinc on the dish. I tried to make a 1.2m using gal iron sheets and it was a dismal failure.
Yes, I did thoroughly check the shape, focal length, etc., etc.
Zinc/gal is commonly used on better-quality dishes which are then either painted or powder coated, so I doubt that would be the reason why your DIY dish didn't work.
Min (12-09-11)
I'd steer away from using any metel based primer for resons stated.ie reflection issues. Better to lighty sand & use a rust inhibitor, then spray with matt white.
I disagree, the primer is just an anti-rust coating, not the final coating so it will have no bearing on heat reflection.
The dish is metal... it's meant to reflect.
Darker colours will reflect less heat into the LNB, compared to lighter colours.
my dish is rusting, the paint is peeling & i get a great signal. If it aint broken...... then leave it alone.
Yep... as mentioned previously, depending on how good the signals are, you can get away with it, however, if you were trying to receive a very weak transponder, a dish with a poor surface compared to a dish with a good surface can be the difference between reliable reception and no reception.
I painted my steel paraclipse dish about 9 years ago with Watyll killrust enamel and it worked well. Most of the killrust range is gloss but they do have a matte white, so I mixed matte white with gloss green to get a matte light green for the reflective surface.
Ok fair comment. I'll clarify. Any added metal to the dish surface if not perfectly sprayed can cause Signal reflection. So any lumps or bumps on the surface will reflect the signal away from the LNB/LNC. Thats how the dish works.
As for colours, gloss aint good as stated. There's lots of different colour dish's out there & all work.
Cool! Found another dish, 90cm x 75cm-ish Strong on hard rubbish
Found some zinc primer at my old folks house. I'll give both dishes a light sanding and spray with zinc primer then with probably matt dark gray..
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