I have zero home improvement/DIY experience. I got someone recently to carry out an unrelated repair on my porch, and he offered additionally to apply sealant to the exterior porch window frames, as some patches were exposed to rain as the sealant seemed to have pealed.
He scraped off what was there and said he would apply mastic, and it looked fine at first. However it didn't dry and after a few days had bunched up (as below). (I asked him to come back but have given up there). I assume he used a product intended for indoor use as the vertical sections look ok but the horizontal sections look like this (i.e. similar to how it was before):
Should I scrape off what he applied and put on some caulk? It being December and me being in London, it's been raining, so I assume I'd be locking in some moisture.
Or better to wait? It would have been rained on a fair bit more by then, but perhaps after a dry spell in the summer when the wood's hopefully had time to dry out a little?
(Perhaps I should remove the top few millimetres of wood but don't have the confidence to do that especially as the pane of glass is a kind no longer supplied.)