hi all just taken off the inside surround frame from sky light vent to check for dampness ,alltho its not leaking there is signs of previous water damage in the roof as its spongy around the frame can i drill a couple of small holes and spray it with spongy floor spray ,around the interia frame , its a swift corniche 12/2, 93
If its spongy around your rooflight frame it will be because the wooden frame is rotten due to water ingress so you need to replace the wooden frame, so the answer to your question is no.
As for a repair it depends how bad it is. If the wood is wet but intact then the easy way is just seal the rooflight frame so no water is coming in from outside & hope it eventually dries out, ie a bodge but the easy option. Otherwise you will need to replace wooden frame.
The spongy feeling is because the wood has separated from the foam. The glue between the plywood and foam breaks down and the wood then expands. Giving you a bulge. Thats the spongy feeling.
The glue expands and fills the bulge giving a firm feeling again.