I've used this product for rebedding windows and sealing solar panel fittings on my motorhome and it's worked well. Proper blu-tak texture stuff that you can ball up or make up little rings with. Didn't think the price was too bad, and it's NZ based so shipping is quick. Might do if anyone just needs a roll quick-ish.
https://www.wyatt.co.nz/product/x_sku/PF2020.html