I removed my spoiler and got plugs from Home Depot, however the driverside plug isnt so flush and my rear window gets fogged up due to the leak. What type of sealant would you guys recommend for the plug on the trunk that wont ruin the paint much and have the ability for removal for future purposes.

 

Just cap it don't seal it IMO.

 

The cap isnt enough to stop the air flow though. cold air leaks inside and fogs the back window

 

you could try weather stripping adhesive, but id do it in the inside in the hole so you dont get so much on your paint.

(edit) hehe do it in the hole... that made me laugh.