I built some alcove and painted it with Eggshell paint. I primed the MDF prior to applying 2 coats of the eggshell. I am finding that it’s a dust magnet and I am constantly having to wipe it down and as a result I fear it may degrade the paint. Do you think I could apply a clear varnish to the wood to make it more durable? And if so, what do you recommend? Thanks in advance.