Mister Quickie

I saw on TV a home spray mainly used for insulating gaps that's waterproof but that seemed to be mainly for interior use.

Is there anything similar for the car (outdoor) that I can either spray or brush on that will provide a clear waterproof seal?

I'm not too concerned with appearance, I was in a rainstorm today and the roof was leaking (deleted sunroof), along the sides of the trunk (even with recent hatch seal replacement), and a bunch of other places.

In case there is no viable option, what is the worst that could happen if I just leave it in the rain (no interior to mold up)?

jagdhund

lol, I've never used it but I have heard that it actually kind of works.

veleno

Silicone sealant? They sell it at home depot in the paint department.

V2Rocket

If the hatch seal is new then your hatch is probably misaligned or the pins need to be adjusted to close it tighter.
The edge of the frame seals on the rubber.

Your car was a factory sunroof delete, or you did something to eliminate the roof from opening?

Mister Quickie

not a factory sunroof delete, the body shop used bondo.

I tried the Rustoleum version of Flex Seal, I bought the clear, I'm not big into aesthetics but it looks horrible.

I think I'll used squeeze tube silicone to make things even rather than the spray silicon

V2Rocket

have you considered a tarp?

veleno

I think he also needs a solution for when he drives the car and it's raining, but if not a tarp would work.

Mister Quickie

The tarp looks to be the parked option.

In motion, I think I'll just use manual (as opposed to spray) caulk and get it as clean as possible.

The spray Flex-Seal Rust-Oleum version as you can see doesn't look that appealing so I'll scrape it off

veleno

So they sealed it with bondo which is now starting to crack allowing water to enter and flood the interior? Do you still have the drain hoses attached and are they functional? If yes, it might be clogged and needs to be cleared to allow water to drain and not collect.

Mister Quickie

Correct. The drain hoses are gone and shouldn't need to be there in the first place. I just bought some regular clear silicone caulk and did the roof.

I also bought a tarp.

The roof leaks I think I can manage with a less-than-showroom caulking job. It's the hatch leaks (brand new hatch seal) that's puzzling me

jagdhund

Use some some clear duct tape, you don't care what it looks like anyways.

mhr

the red 3m tape used to tape down vapour barriers in construction works really well.

Here is a link to what I am talking about although I am sure you can get it at any home depot.
http://www.nhsmediastore.com/3M8088.aspx