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Old 09-29-2013, 03:42 AM   #1
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I need caulking repaired in a few places on my 5th wheel. The dealer uses Silicone. I have never used silicone caulking on fiberglass seams. Any opinions on this. Thanks ...Al

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Old 09-29-2013, 03:54 AM   #2
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I use 3M white silicon caulk on everything but the roof. I have been using it for years with good results. I get mine at Lowe's but Home Depot may carry it. Just make sure you clean the area good before applying.
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Old 09-29-2013, 08:35 AM   #3
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OEM uses Sikaflex or Proflex, non silicone based caulking. I use silicone inside but not outside. Also, silicones chemical composite makes it a poor choice if you want to apply it over old silicone. Use Dicor self leveling lap sealant for the roof surfaces.
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Old 09-29-2013, 10:06 AM   #4
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I have had good luck with Proflex RV. I'm sure there are others that work as well. Silicone is easy to install, but difficult to remove when it's time for a reseal.
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Old 09-29-2013, 10:18 AM   #5
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Proflex is what I use...works great on the sides
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Old 09-29-2013, 10:18 AM   #6
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Very hard for silicone to stick on silicone. Better off with the Proflex.
Good luck.


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Old 09-30-2013, 12:30 AM   #7
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Finding it very difficult to do a nice neat caulking job. Don't feel like paying $100.00 an hour to have the dealer do it. What is the secret to doing a nice job?...Al
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Old 09-30-2013, 12:39 AM   #8
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Better quality caulking (silicone or acrylic latex)seems to flow better - but always slow down, very very slow squeeze on the gun as you move (I find a slight pull and move while waiting for caulk to slow and then another very slight pull - can't be continuous squeezeif moving veryslow). If using silicone, don't try to tool it a lotunless you do it right away (gloves) before it skins over or you'll have a mess. Tape off edges if you want a really clean look with masking tape (remove quickly before it skins over). Cut very little off of the tip or you will be too wide. The more you do the easier it gets but never try to rush it. If using silicone based (I prefer for things like the trailer and outside work), I use the CSL Silicone in Clear or Translucent but you can get it in white and a few other colors as well. Clear is a good choice if your trailer is painted. Translucent hides more if you have a gap.

Edited by: WildWildWest
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Old 09-30-2013, 12:41 AM   #9
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Good prep, completly remove old caulk. There are plastic caulk removal tools (Home depot, Lowes etc) They work well and don't cause damage. You need a clean dry surface proper bead size and patience. If you draw the bead with you finger keep it wet with a mild soapy solution. A decent quality caulk gun also helps. It is a fast learning curve. Good luck.
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Old 09-30-2013, 11:35 AM   #10
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Blue painters tape, small opening and a 45 degree tip, and mineral spirits on a rag with the tip of your finger.
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