The plastic on my hatches was cracked & glazed on my Hunter 88 - 28.5. What I did was to remove both of my hatches and remove the plexiglass and replace the using new plexiglass (smoked color, as before). They both turned out very well.
I did make a make a mistake on ordering the new plexiglass in that for the smaller hatch (above the table, about 11x11) I ordered 1/4” and the forward hatch (22x22) I ordered 1/2”. Both shounder have been 3/8”. The smaller hatch I raised up in the frame & sealed with 3M 4200 so that it was level with the top of the frame, and the larger hatch I rounded off the top edge and smoothed the edges out with a torch, and they will both be just fine. When putting them together I used some small nuts as spacers and and put masking tape around rhe perimeter for a cle line when removed, and sealed them. I’m quite pleased with both.
The side window covereds (~48 x 7) were cut out from 1/4” plexiglass (again smoothed the edges with a torch) using the originals as a pattern and will re-attached with 3M 4200 as well.
Sir Michael