The gentleman nearby who just did a franchise with Modern Beekeeping sells the full size high density hives. They recommend painting them and using masonry paint, I guess that adheres better. I asked him about it because I was disappointed, thought I'd found an way not to paint. He said they won't rot of course. If they're constantly wet they can grow algae like you see on the north sides of buildings sometimes, which again isn't a big deal except for looks. The real reason is as you suspect, the UV will get 'em, so I'd paint.

 

Here's what Dow Chemical, the owner of the Styrofoam brand says:

STYROFOAM™ Extruded Polystyrene Foam Insulation must be covered to protect it from sunlight (UV or ultraviolet light). It should be covered within 90 days of its installation. Sunlight will very slowly begin to degrade the insulation, changing the surface from a rigid blue plastic to a yellow powder. This does not change the properties of the insulation below the surface, but it can result in a loss of insulation thickness over very long periods of time (years).

http://dow-styrofoam.custhelp.com/a...92/~/how-long-can-styrofoam™-brand-extruded-polystyrene-foam-insulation-be-left

 

The UV will break it down. It holds up pretty well if painted except that mice can chew it easily and the carpenter ants love to live in it...

 

I've had hive covers for 5 years now and have not broken down with this Oklahoma heat. Biggest mistake is setting a hot smoker on them and of course you have to set something on them to keep from flying off in this 30 mph wind. Never painted and I like the fact they don't get stuck but after five years they are not the prettiest cover but I do think they protect some from the heat!!!

 

I have 50+ of the EPS nucs from Betterbee. They are on their 4th year and are starting to break down. Also the bees are chewing the foam at the frame rests. I do not see any better survival during the winter in them than my wooden nucs. But the bees seem to build up quicker in the spring in them.

 

I have 50+ of the EPS nucs from Betterbee. They are on their 4th year and are starting to break down. .

I would consider applying a hard-coat to the boxes. I received samples of StyroSpray from Industrial Polymers and it looks pretty impressive. A prime coat of Kilz latex can be applied in place of the company's primer.

http://www.industrialpolymers.com/

The StyroSpray can be applied by brush.

There are numerous videos to watch online.

 

I have polystyrene (styrofoam) hives.

It's advisable to paint them to make sure the tiny gaps between the poly granules don't fill up with algae, UV damage is less of a problem with new hives than it was a few years ago, but there are people who've been using them for years without painting the outside.

You can use masonry paint or any vinyl emulsion. I used vinyl emulsion intended for bathroom or kitchen, areas likely to have high levels of water vapour. Two coats was enough.

You don't need to paint the inside, but a layer of vaseline (petrolium jelly?) along the hive runners or frame rests will stop them being propolised.

If you use a landing board, which is a good idea for mating mini-nucs because it helps the queen find her way indoors, you can paint a pattern on them to help the bees identify their home.

 

Thanks BeeCurious. Looks like it might work.

 

Call them in Texas, the guy I spoke with was very friendly and they sent me samples. One is plywood and the other is on EPS. I believe polyurea truck bedliner could be used too but it's certain that the StyroSpray won't cause a meltdown.

 

I made some nucs out of 2" foam from Home Depot but the bees chewed them very badly around the entrance and the frame rest area. I think this stuff will work on them too. Might make for some cheap mating nucs in custom sizes.

 

Forgot about the bedliner. The modernbeekeeping folks had one had their stand at the ABF conference that was coated in bedliner. It was black, not sure on the merits of that (is black but insulated ok?), but it looked bomb-proof.

 

be nervous to try that on the inside of the hive. I think the StyroSpray is just the ticket. Has good hardness that should stop my chewing problems. I'm going to order a couple quarts this morning. Wonder if you have to mix it all at once?

 

I wouldn't put the $tyro$pray inside. I don't know what people's experience has been with a latex but I would try Kilz on the inside.

Bedliner coatings can be white as well...

 

I've tried oil based, latex and Kilz. All 3 get chewed. Once cured don't see how it would hurt. Would only put it where the bees would chew... around the entrance and the frame rest area.