I have a small section of older proflex that has cracked on my roof. I don't want to redo the whole thing this year if possible. Will new proflex stick to old proflex? I tried to put a little silicone on it but i can see that it's going to peel off already.
Just for a little background, this is a 1983 terry trailer and about 3 years ago I resealed everything with new putty tape and proflex. I think i went wrong on the proflex by smoothing the bead out like you would with caulking which made it too thin in parts.
I'm assuming you mean proflex RV the caulking type product? Also the type of roof material may help as well, IE TPO, metal, etc. Were is this small section? Is this a large area of roof or caulking area on the edge or around vents, etc?
Typically folks use the Dicor self leaving sealant on the roof for edges, transitions, etc and can be reapplied directly over the old when doing touchups. The proflex RV sealant may be ok for the roof but as you pointed out is touch to spread out in large areas. The Dicor product will do just that and self level. I'm not sure if Dicor can be applied over the proflex
BTW silicon should not be used for the roof. It just can't stand up to the stretching, shrinking etc and will pull away eventually and cause leaks. Plus if you ever want to use eternabond product it will not stick to silicon.
You know....after reading Clearnetedm's response - he/she is right. The white caulking on your roof is very likely not ProFlexRV - it is probably Dicor. ProFlex RV is typically used around widows and seems on the aluminum or fiberglass sides. Dicor is almost always used on the roof.
Dicor is also specifically designed to stick to itself. Same procedure. Clean well with alcohol, then simply goop a healthy portion of self-leveling dicor over the old stuff.