Insert Character

Q.
Initialy l wanted to insert a quote at the beginning and end of the filed. But l went on to try and insert a comma after the quote. Below are the steps that l followed. It basically gave me what l wanted to see but the problem is that ist got spaces in between which are too big and l getting an error as listed below.

Error Message
Server: Msg 8152, Level 16, State 9, Line 3
String or binary data would be truncated.
The statement has been terminated.
'1000101DF000' ,'1000101DF002' ,'1000101DF004' ,'1000101DF006' ,'1000101DF008' ,'1000101DF010' ,'1000101DF012'

What am l doing wrong from step 4? Is it possible to insert quote and a comma then remove the last comma in the table not printing to screen like l'm doing? If so how. Thx for the help thus far

Step 1:-
/** Select a 100 records then insert the characters **/
select top 100 * into Temp1 from Temp

Step 2 :-
/** Insert a quote at the beginning of a record **/
update Temp1
set field = char(39) + rtrim(field)
where left(Field,1) <> ''''

Step 3 :
/** Insert a quote at the end of a record **/
update Temp1
set Field = rtrim(Field) + char(39)
where right(rtrim(Field),1) <> ''''

Step 4 :
/** Inserting a comma after the qoute at the end of the record **/
Declare @Temp1 Varchar(200)
Set @Temp1 = ''
Update Temp1
Set @Temp1 = @Loan2 + Temp1 + ','
Set @Temp1 = Substring(@Temp1,1,len(@Temp1)-1)
-- to remove extra comma at the end
print @Temp1