westend wrote:
Siliconized latex caulk is not the caulk to use. I'd suggest to buy some 3M caulk remover and remove the Alex Plus. That will also allow you to see if the fiberglass is cracked (a real possibility). If the fiberglass is cracked, you will want to patch that with resin and fiber or just resin. Caulk will not hold it together for long.
The best caulk to use on the exterior is one of the polymer sealants made by Geocel. They are engineered for the transportation industry. Tripolymer 2300 adhesive and Proflex RV are two types of sealant made by Geocel.
This caulk is in the seam holding the roof onto the van. I could not remove all the caulk without removing the roof. If I remove the roof, I will not be able to do the van build this year. I would have to rebuild my old van (now gutted) and use it again this winter, find a place to store the maple flooring and other matierials I bought while I am gone, etc., etc.
I will do it if it absolutely has to be done, but it will destroy all my plans for the coming year.
As an alternative, is there a better caulk that would stick to the Alex Plus, that I could use as a top coat?
I will look again, but I can see all but the bottom half inch of the fiberglass roof, and I do not think there are any cracks.