3 years ago I opened my headlights to black the housings out and re-sealed them up nice. I have had no issues with water seeping in until now, theres a slight amount of condensation inside. I am going to re-seal tomorrow but want to know what is the best way to remove moisture from inside without separating the assembly?
I was thinking remove bulb and use compressed air or hair dryer...Is there a better way that I am not thinking of?

 

Nope gotta take everything off including the lenses. Just reseal it again and clean the lenses

 

I had the same problem on my last car. What you can try to do is remove the headlights and spear a thin layer of clear/black silicone on the joint where the lens meets the headlight housing. Make sure you clean off any excess as it will attract some dust when cured. Beats the hell out of pulling the headlights apart IMO.
My factory sealed headlights had a little fogging in them the other day when it was cold out FYI.

 

Oh and dont wipe the inside of the lenses with a paper towel. if you must take apart the headlight, use only a lens cleaner approved for Poly Carbonate(look at the stamp on the front of the headlight lens to be sure, PC = polycarbonate.) and wipe gently using a high quality microfiber towel. If there is any residue left on the headlight housing it will create a haze when the headlight is turned on. Also if you do get an instant where the headlights do fog up again, it will look like the bathroom mirror after a hot shower. Yowzahz! good luck!

 

If you can pull the bulbs out and let them sit for a day or 2 by a heat vent in the house if you can, they should dry out on their own. Also if you have a silica packet or 2 laying around stick/wedge them in the bulb openings and they will help draw the moisture out.

 

I had that problem with a brand new pair of headlight for my RSX and I drilled a small whole ( 1/8 drill) to the bottom of the light and I never had a moisture problem again

 

Do what he said you should be fine. Did it to my old accord. Never had a problem again

 

drilling a hole will allow for the headlight to breath. But i have seen many headlights through the shop with holes drilled in them. it allows moisture out but it also allows moisture/dust IN! It is an acura! dont butcher the headlight by drilling a hole. do it right! on my last car when i had fogging after blacking out the headlights i did this.... heat in the oven for the same amount of time you used to take them apart, then press the joints of the headlight/headlight backing very well ensuring a good seal. Keep in mind that when heating the headlight up you will be softening the "glue" that holds the two pieces together. So press them together while it is hot so it will form and contour to the shape of the joint once again.
if this doesnt work do the silicone sealing. thin bead of silicone all the way around the joint, then smooth with your finger. Much cleaner and longer lasting than a HOLE in your ACURA headlight.