I found uhu por very stringy, and it sets "soft" so doesn't sand well. I use canopy glue now.
The other thing to remember when using Depron, is to seal it completely before painting (esp if using rattle cans) as the solvent will attack the Depron, and can eat it away from underneath a sealed surface, if you are unlucky with overspray.
There was a good article in Model Boats Magazine a few months back by Ron Rees on building and finishing using Depron.
Chris