Yes certainly,its something we do in the HotRod shop on MDF patterns and interior pieces i.e stereo housings etc so that moisture cant effect them,its basically West system epoxy mixed as per instructions and then thinned with about 30-50% with acetone depends on the viscosity of the mixed west systems epoxy, you dont want it too thin but not too thick so as to not soak in you dont want to have to flatten out a thick coat of epoxy afterwards, if youve done it right it should look like you have wiped it with naptha to swell the grain, I use a combination of brushing and wiping with lint free rags to cover the guitar, being this thin it tends to soak straight into the wood,sometimes I may go back over it depending on how much it soaks in,then let sit overnight or until cured then I go over it lightly with 400 grit paper to knock any furryness off then I mix another lot at maybe 30% thinned and wipe it on again with a clean lint free rag ,let that cure and usually it only needs a rub out with 400-600 and then you can go on with nitro or what ever finish you are using,the beauty of this grain fill method is that you can cut the amount of nitro based sealers back that you would normally need or having to use water based grain fillers,this method work extremely well on acoustics as it cuts back on having 20 plus coats of nitro clagging up the wood,obviously if you are going to stain you need to do that first,i havnt tried stain first so Im not sure if the acetone mixed in the epoxy would wash it ,when I get to the stage of finishing this guitar I may do a video of how I do this .
Shane.