tl;dr? What I can I use to bond the sand-filter-base to the sand-filter?
I have a sta-rite t-200bp-1 sand filter.
The problem was that the top of the sand filter was not level with the base of the filter. Looking at the sand filter I could see that the base is not centered to the bowl bottom of sand filter. The sand filter was tilted. I would compensate for this by putting a wedge under one side of the filter base. The unions wouldn't align at the same height or square to each other - but I had perfected the art of fiddling with them until it worked.
I poked at the "glue" that attaches the base to the sand filter and found it be a soft grey adhesive. The sand filter is 8 years and this adhesive is still rubber like. Not hardened at all.
A-HA! moment I realized I could fix this annoying tilt.
So I decided to separate the base from the sand filter so that I could correct the sand-filter-base to sand-filter alignment..
Disassemble went without any trouble - adhesive cut away and residue adhesive removed with acetone. With base apart from sand filter I could see that the base interfered with the centering boss on the bottom of the sand filter. I fixed the interference by modifying the base and now the sand filter can sit perfectly on the base.
OH-OH moment I realized I don't know what adhesive to use to re-bond the base to the filter.
I think the the sand filter is made from Polypropylene. A quick internet search tells me this stuff is hard to attach to with an adhesive. I found some glues that come with an adhesive promoter - adhesive combo. They come in 1.5 oz tubes and are very expensive. The adhesive that was bonding the parts was very much like the grey polyurethane masonry sealant-calk used around windows.
Does anyone know what I can I use to bond the sand-filter-base to the sand-filter?
Thanks for your suggestions.