Steve:

I have used Lusterkote clear over "shelf paper" type coverings to protect their graphics and it worked fine. I have used it over home made decals on both Ultracote and Monokote and it worked except if you really looked at it you could tell where I had sprayed around the decal. Perhaps you could spray some into a container then use a detail or finishing brush or Q-tip and apply around the seams. I never scuffed the surfaces - just cleaned them with alcohol first.

I have used water-based Poly-u for seams around the firewall/cowl area and that worked. HOWEVER, the water-based Poly-u that I use is Varathane Super Diamond Floor Finish and it is about $42.00 a gallon at Lowe's. Since I use it for fuel proofing, flight box finishing, glassing, etc a gallon of the stuff fits with what I do.

I usually do not have a problem with my Ultracote seams and I only do them around the firewall/cowl areas and I only do them as sort of insurance - but I am sure it never hurts to do all of the seams.

My experience here.....

Dan