Been looking back through the archives but still a little unsure. I am gluing a 1/2" minicell pad to my wood backband. The backband is coated with varnish and sanded for some bite. I've seen 3M Super 77, contact cement, and Household Goop...what's the best?

Also gluing in varnished wood bulkheads. I have spot glued them in with hot melt glue with an 1/8" gap or so. I planned on using silicon to finish up but read that's a bad idea so now thinking 3m5200. I don't like the idea of white sealant but I hear it comes in black too, but harder to find. Would rather it be clear but I could live with black. Is this the right product for the job?

Thanks