I used a product called Microscale Liquid Decal Film that I found in a local hobby shop. Use it to coat the vintage decals to help hold them together. It does make it a little more difficult to work with them as it stiffens them somewhat.
I've always used Solvaset to get them to snuggle into the details of the body. With the use of the film beforehand, I have to apply multiple applications in some instances.
Next build for me is Monogram 1/32 Lola T-70 and a refurb on a really nicely made Mono 1/32 Lotus. That is...the chassis is nicely made with rear axle ball bearings soldered in place and a ball bearing soldered on the motor. The guide flag was modified to a fixed configuration and the blade whittled down to pin. Has beveled gears and nicely contoured rear silicone tires.
Very smooth. Unfortunately, the body was spray painted orange....everywhere,... including cockpit, driver and engine detail!
Stripped the paint with Liquid Plumber and now ready to detail it and add decals.
Lots of fun!
Jim