I've been using Krylon's UV-resistant clear spray (item 1309) on my scratchboards. Not sure if it's what you are looking for but I do like it.
>From: Linda Feltner [[log in to unmask]]
>Sent: 8/20/2014 8:09:14 AM
>To: [log in to unmask]
>Subject: Re: [SCIART] Spray Finish for gouache and scratchboard
>I just can't think of the name of the spray stuff that folks are now using for
>gouache paintings and colorized scratchboard. It's not a "fixative" but a spray
>polymer that has a UV component to it. It puts a finish on the painting where
>one does not have to use glass.
>There are probably several brands, can you recommend any?
>Linda M. Feltner Artist, LLC
>P.O. Box 325
>Hereford, AZ 85615
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Heather Ward Wildlife Art [log in to unmask]