Need 70 degrees for 3 days

I need 70 degrees for 72 hours.

Details: I need to use Epoxy on my kayak, and after each application, the temp needs to be at or
above 70F, for at least 12 hours. I need to apply three layers, in three sessions.

I’m an open hours member, so I have access thursday -sunday.

I’m wondering if I could use the classroom and my space heater for this. Also wondering if i could be granted access to come in each morning, and apply the next epoxy, and warm the room.

If this is not ok, i’ll just take my kayak home, and do the work in my living room.
Thank you for considering this!