The only advice I have here is to use a silicone based spray.
All the RV Seal cans I have seen use a water based emulsified silicone as the primary ingredient. Use either the premium RV silicone spray or Protect-AllŪ Slide-Out Rubber Seal foam spray lubricant. I prefer the latter and find it easy to apply, very effective and long lasting.
The slide MECHANISM should only have a dry based (on wet; dries dry) lubricant. NEVER use grease or oil. It will attract dirt and road grime and jam your slide over time.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW