I'm building several HO structures for our clubs modular layout. They are replacements for some modules (four 6' modules) that are showing their age after 30+ years of setting up, taking down, transporting and storage. The shells of the structures should be finished and attached to the modules before we need to setup next time. However, some of the interior details and lights may not be done.

Hello fellow modelers,

I have a road that is dry wall mud covered, sanded and painted grey with flat acrylic . I need to know  the secret behind taping white traffic lines on the above without removing the grey road color.   Please let me know and thanx very much. Steve Klein 

After searching across various sites about how to color or dye wood for a weathered look, I decided to do my own testing and post the results here complete with exact proportion details in case it would be helpful to others like me who were trying to do similar things.

For this test I used a full 32 oz bottle of 70% isopropyl alcohol mixed with 1 teaspoon of Fiebing's Black Leather Dye, in a cut open 1-gallon milk jug.

I've got a prototype garage that I am modeling where they walled up one of the garage doors using unpainted particle board.  Naturally it has weathered grey in the lower parts of the wall exposed to the weather.  Looks pretty bad but would make a great model.  Any suggestions for modeling particle board in HO scale?  I've done a search and not found anything.