Hi Blain,

In my humble opinion oil based weathering products are easier since they have a longer drying time.

You can make the weathering products yourself with oils and enamels. I suppose you have some of this products since aircraft modellers also use them.

You can take a look at missing links rarities world were they explain the different techniques and how to make them by yourself.

Other useful YouTube videos are IPMS Toronto Barbakan applying filters, applying washes and streaking effects. They are good videos and they show how to use commercial and how to make and use DIY products.

Wilder's YouTube Channel is an interesting one to have a look. He uses all kind of products and can help you see all the process of painting a tank.

You might find Michael Rinaldi AFV Painting and Weathering Workshop and Civilian/Gundam Painting and Weathering Workshop interesting also. He uses mainly oils for all his weathering and explains how he uses them and his philosophy.

I hope this helps you a little bit.

Regards,
Angel