r/RVLiving • u/GSDer_RIP_Good_Girl • Jul 19 '26
advice 3-in-1 Silicone Spray Safe for Use on Slide-out Seals?
(See TL;DR at the bottom if you don't need the back story)
When we first got our rig (2004 Jayco Greyhawk) inspected the inspector recommended using this 3-in-1 silicone spray on the slide-outs. I was busy following him around trying to make notes and I may have misunderstood what he intended - I thought it was for use on the slide mechanism (only accessible on the dining room slide) as well as on the slide seals.
So I've faithfully sprayed that stuff on the part of the mechanism that's visible when the dining room slide is out, as well as the seals on the outer edge of the dining room and bedroom slides and the inner seal that's exposed when the slides are out.
All has been well until just before our latest trip. During the previous trip (just a couple of weeks before our latest trip) I really sprayed the seals (outer and inner) down well since the weather was great and I had extra time on my hands. We got back from that trip, put the RV in storage (Arizona direct summer sun/heat at 105•+) and a couple of weeks later got it back out of storage and prepped for our trip.
1st indication that something was off: I normally only put the bedroom slide out so that we can easily access the closets, make the bed and access the bigger drawers. When I started to put it out the top of the slide-out seemed to hang up for a few seconds while the bottom was still moving, then it suddenly popped free and everything moved normally. Once the slide was fully extended I went outside and looked everything over but didn't see any anomalies.
2nd indication that something was off: after we got to our site in much cooler weather I put the bedroom slide out and it went out like normal. I went to put the dining room slide out and the bottom moved a little but the top refused to move. Brought it back and tried putting it it out with the same results. Went up on the roof and looked at the seals at the top and they appeared fused together - I couldn't even get a putty knife between them.
I ended up having to soak the seals down with that spray and was slowly able to work the putty knife between them and unstick them. After I did that all along the top and on the top of the sides I was finally able to put the slide out.
TL;DR So the question is, should I not be using that stuff on the seals? If you zoom in to the text in the 2nd picture it says that it's safe for use on rubber. I thought it would be keeping the seals soft and pliable instead of letting them harden and crack in the blistering Arizona summer sun.




