I've used Randolph's dope with Dupont 3608 (and variations) together. But it's hit and miss. Lacquer is generally temperamental and sensitive to conditions. Using products that aren't matched is taking a chance. I'd say do a test panel. See what you get. I tend to be careful about it and try to only use products that are formulated to work together, but other stuff can be done successfully. Just don't shoot you're brand new plane with something you haven't tested out. It can be crazymaking.

Thanks guys for responding to my query. I've used Sig dope products exclusively for about 20 years with no problems. What frosts my cookies is the hazmat charge they tack  on for gallon containers.. I've learned from this forum that Aircraft Spruce gets by without hazmat fees by classifying dope products as industrial adhesives. I wish Sig could get away with that. Everything I use for my hobby has to be mail order because I live in northern North Dakota in the middle of nowhere . I'd really like to try Randolph dope but I think the secret,as stated on this forum, is the thinner and Randolph thinner is just as costly as Sig. I put a lot of time and money in my toy airplanes,as does everybody else,and I guess it doesn't make sense to cheapen up at the end. Thank you again for the help. Doug       P.S. Since I live in a cold climate and we only have 2 days of summer I've found that you can spray dope outside down to 20 below! Won't dry at that temp ,but you can spray outside and bring it into the shop to dry no problem. Added bonus no bugs or dust!