How to seal coasters?

[Susanne2]

I have painted a design on drink coasters with acrylic paint.  I want to be able to use them for hot cups and possibly plates from the oven.   Would Rust-oleum ultra cover gloss clear spray be suitable?  If not could you suggest a suitable alternative.  Many thanks for any help.

[Zuko]

It worked really well. Thank you so much for guiding. Would like to share the results:) 

 

 

 

 

[MitchellMc]

Wow, @Zuko! Those look a-ma-zing. You're very talented.

I'm so glad the coating worked well. 

Mitchell