Re: advice on buying a glastron with an old 115 mercury
Glastron is a fine boat (ask James Bond

), their hulls are usually nice running boats. My biggest concern with that boat is rot. She's been left outside unprotected for a while, so there's a good chance that you've got some structural issues going on.
Trailer looks good though, so you can probably recover $600 back outta' it all if you can't make it go.
On the Bond movie I understand that Glastron built 12 of those boats just alike for the shot; red and white as I recall. In case a viewer missed it, they were running down a canal/river in Florida at WOT in a chase scene (Bond being chased) and there was a road across the route; just a raised grassy levee if you will with a shell road on top. Bond (stunt man???) ran up the rather steep bank at WOT became airborne sailed across the road and the rest of the levee and hit the water on the other side still going. Don't know how many of the boats didn't make the stunt before the shoot. An Evinrude V4 was the power plant.
Glastron used to be made in Austin, TX. President Lyndon Johnson had a couple. One for him and another for the SS. As the story goes, he usually ran on Lake Marble Falls N. of Austin and the boat the SS had didn't have the big 400+ big block Chevy that was in the boat Glastron especially made for him. So he could outrun them and is said to have enjoyed that. His ranch was just up the road from the lake near Johnson City, TX.
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Boat has been sitting out as others said. If it sat with the bow up and the drain plug out you may be ok except for where the seats attach to the deck and the seats themselves....rotted wood.
The engine not running could hide some serious flaws that could cost a bunch to fix. In starting an engine that has been sitting, I agree that you need to lube things up and ensure adequate cooling before you turn it over.
I noticed a whales tail and wondered why one would need a tail on that small a boat with that large of an engine. Then I looked and noticed no PTT. Probably the reason.
$600 isn't a lot of money and as said the trailer would probably bring that. If the engine is not reasonably recoverable you could make some more $$ parting it out on ebay or something of the sort....Craigs list???
Good luck.
Mark