Yikes! 90 degrees is really getting up there. Most spray cans will tell you in the instructions what temperature range their product should be used in. Have a look to see if yours makes any mention of that.
Edit: I just had a look at several spray cans I have sitting about and though they all mention a minimum temp very few of them mention a max temp other than don't apply to a surface that's 200 degrees or more(duh). So even though it's a logical concern the manufacturers aren't offering much guidance in that regard.
