I bought sidemarkers a while ago on ebay, but one of them tended to fog up so I removed them. Id like to put them back up now, but dont want them to fog up any more. Is there some kind of spray sealant I can use to keep the plastic airtight?

 

you can try using silicone always works best especially when people paint their housing in their headlight and put the lense back together

 

Just make sure the inside is bone dry before you seal it or you will have permanent fog.

 

I had one of my OEM clear corners do this. I simply filled it up with water, Blew into the hole and then I easily located were the hole was, marked it and let it dry out. Next day I used some silicon and now its been good.

 

Just did this, got squirted in the face haha, thanks for the tip, Im waiting for them to dry now