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Question Method for prepping fiberglass roof for 3m tape and Dicor?

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jmltech

RVF Supporter
Joined
Dec 27, 2019
Messages
133
Location
Salida, CO
RV Year
2019
RV Make
Tiffin
RV Model
RED 33AA
RV Length
35
TOW/TOAD
2017 Jeep Wrangler Sahara
Fulltimer
No
Hi all,

What would be the best method for cleaning and prepping a fiberglass roof in preparation for applying 3M VHB 4950 tape and dicor? I’m going to install some solar panels, and wanted to make sure I get the best adhesion. Should I clean with alcohol, denatured alcohol, acetone or something else??
 

MapNerd

RVF 1K Club
Joined
Nov 17, 2019
Messages
2,299
Location
Prince William, VA
RV Year
2020
RV Make
Newmar
RV Model
Ventana 4326
RV Length
43
TOW/TOAD
2020 Ford F-150
Fulltimer
Yes
1. Pressure wash
2. Remove old dicor and 3m tape if replacing
3. Apply mineral spirits to area to receive dicor and 3M tape using a clean microfiber cloth
4. Wait for area to air dry
5. Apply dicor and tape
6. Drink beer

Step 1 is probably optional but I always do it before a roof job. A clean roof never hurts.
 

DavidL

RVF VIP
Joined
May 8, 2021
Messages
113
Location
Metamora, MI
RV Year
2002
RV Make
Newmar
RV Model
MountainAire
RV Length
4370
Chassis
Spartan K2
Engine
Cummins 500hp
TOW/TOAD
Grand Cherokee
Fulltimer
No
What MapNerd advises. I wet sand the gelcoat to ensure all is cleaned after Step 4. Followed by another cleaning.
 

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